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WAEC 2019 - FURTHER MATHS ANSWER
WAEC 2019 - FURTHER MATHS ANSWER

WAEC 2019 - FURTHER MATHS ANSWER


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FURTHER MATHS OBJ:
1-10: AACACBDABC
11-20: DAACCDBDAA
21-30: BCCBABABCC
31-40: BCCBCCDDDD
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There two sections in this question ie Section A and Section B.
Section A (1-8)
Section B (9-15) divided into THREE PARTS ie I,II,III.

Candidates are required to answer All in Section A and Any FOUR in section B but atleast ONE from each Part in Section B.

1-8 (must)
Choose one or two from either these parts
Part I (9,10,11)
Part II (12,13)
Part III (14,15)

Total questions to be answered is 12



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ANSWERS:

(1)
5^4^(3x/4 -1) + 5^3(x-1)/5^(3x - 2)
5^3x/4 - 4 + 5^3x - 3/5^3x - 2

5^3x - 4 + 5^3x - 3/5^3x - 2
(5^3x ÷ 5^4) + 5^3x ÷ 5^3÷5^3x - 2

5^3x/625 + 5^3x/125÷5^3x- 2

5^3x + 5(5^3x) ÷ 5^3x-3

5^3x + 5(5^3x)/625 ÷ 5^3x/25

Let 5^3x = y
y + 5(y)/625 ÷ y/25
y + 5y/625 × 25/y
=6y/625 × 25/y
=6/25

NUMBER 1 FINAL ANSWER IS 6/25




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(2a)
Using y2 - y1/x2 - x1
Where y2 = 7, y1 = -5,
X2 = -2, and X1 = 7

7 - -5/-2 - 7
=7+5/-9
=12/-9
=4/-3
Coordinate points : 
-4/3(3 : 2)
=-12/3 : -8/3
= -4 : -2⅔
X = (-4, 2⅔)

(2b)
2/1-√2 - 2/2+√2
=2(2+√2)-2(1-√2)/(1-√2)(2+√2)
=4+2√2 - 2+2√2/2+√2-2√2 - 2
=2 + 4√2/-√2
=(2+4√2)(-√2)/-√2(-√2)
= -2√2 - 4(2)/2
= -8 - 2√2/2
= -4 - √2


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(3)
Sn = A/2[2n+(n-1)d]
Where Sn = 165
a = -3, d = 2
165 = A/2[2(-3)+(n-1)2]
165 = n[-6+2n-2]/2
165×2 = n[2n - 8]
330 = 2n² - 8n
2n² - 8n - 330 = 0
n²-4n-165 = 0

Using -b±√b²-4ac/2a
4±√-4²-4(1)(-165)/2(1)

4±√16 + 660/2
4±√676 = 4±26/2
4+26/2 = 30/2
= 15 terms



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(4)
Draw the right angled triangle

Using Pythagoras theorem 
Third side = √(p+q)² - (p-q)²
=√(p+q+p-q)(p+q-p+q)
Difference of two squares. 
=√(2p)(2q)
=√4pq
Adjacent side = 2√pq

Tanx = opp/adj = p - q/2√pq
1 - tan²X = 1-(p-q)²/4pq
=(4pq)-(p²-2pq+q²)/4pq
= -p²+6pq-q²/4pq
= -(p² - 6pq + q²)/4pq



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(5)
Draw the diagram

Using cosine law 
Cos∅ = 16²+10²-14²/2(16)(10)

Cos∅ = 256 + 100 - 196/320

Cos∅ = 160/320
Cos∅ = 0.5
∅ = cos-¹(0.5)
∅ = 60°

Angle between 10N and 16N 
= 180 - ∅ (sum of angles on a straight line)
= 180 - 60
=120°




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(6)
Draw the diagram 
Taking moment about the pivot,
(T × 25)=(50×10)+(20×45)
25T = 500 + 900
25T = 1400
T = 1400/25
T = 56N



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(7)
In a tabular form 
Under class interval:
1-5, 6-10, 11-15, 16-20, 21-25, 26-30

Under class mark (X): 
3, 8, 13, 18, 23, 28

Under X-Xbar:
-10, -5, 0, 5, 10, 15

Under frequency: 
18, 12, 25, 15, 20, 10 
Ef = 100

Under f(X - XbarA): 
-180, -60, 0, 75, 200, 150
f(X - XbarA) = 185

Where xA = 13

Mean = xA + Ef(X - Xbar)/Ef
=13 + 185/100
=13 + 1.85
=14.85years


PLS NOTE THAT XBAR LOOKS LIKE X WITH MINUS SIGN ON TOP.



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(8)


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(9a)
Y = 7 - 6/x and y + 2x - 3 = 0
Substitute eqn (1) into eqn(2)
7 - 6/x + 2x - 3 = 0
Multiply through by X
7x - 6 + 2x² - 3x = 0
2x² + 4x - 6 = 0
X² + 2x - 3 = 0
(x² + 3x - x - 3) = 0
X(X+3)-1(x+3)=0
(x-1)(x+3)=0
X - 1 = 0 or X + 3 = 0
X = 1 or X = -3
But y = 7 - 6/x
When X = 1
y = 7 - 6/1
y = 7 - 6
y = 1

When X = -3
y = 7 - 6/-3
y = 7 + 2
y = 9
Coordinates are (1, 1) and (-3, 9)

(9b)
Draw the diagram

Gradient of AB = 9 - 1/-3 -1
=8/-4 = -2
Midpoint of AB = (1+3/2, 1-9/2) = (2, -4)
Gradient of perpendicular = -1/-2 = 1/2

equation of perpendicular is
y-(-4)/x-2 = 1/2
y + 4/x - 2 = 1/2
y = 1/2x - 1 - 4
y = 1/2x - 5
OR
2y = X - 10



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(10a)
Given 4x² - px +1 = 0
For real roots: b² - 4ac >0
(-p) ² - 4(4) (1) > 0
p² - 16 > 0
p² >16
p > ± 4

(10bi)
Given: (1 +3x)⁶
Using pascal’s triangle: 1, 6, 15, 20, 15, 6, 1
(1)⁶(3x)º + 6(1)⁵ (3x)¹ + 15 (1)⁴ (3x)₂ + 20(1)³ (3x)³ + (15) (1)²(3x)⁴+6(1)¹(3x)⁵ + 1(1)º(3x)⁶
1 + 6(3x) + 15 (9x²) + 20 (27x³) + 15 (81x⁴) + 6(243 x⁵) 729x⁶
1 + 18x + 135x² + 540x³ + 1215x⁴ 1458x⁵ + 729x⁶

(10bii)
(1.03)⁶ = (1 + 3(0.01)]
Therefore (1.03)⁶ = 1 + 18(0.01) + 135 (0.01)² + 540(0.01)³ + 1215(0.01)⁴
+ 1458 (0.01)⁵ + 729 (0.01)⁶
+ 1 + 0.18 + 0.0135 + 0.005 + 0.00001215
+ 0.0000001458 + 0.000000000729
= 1.1940523
= 1.194 (4s.f)



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(12)
Prob (pass) = 60% = 60/100 =3/5
Prob (fail) 1-3/5 = 2/5
(a) Prob (atleast two failed) = 1 – prob (ome pass)
= 1 – 10Ci (3/5)¹ (2/5)⁹
1 – (10!/9!) (3/5) (2/5)⁹
= 1 – 10 (3/5) (2/5)⁹
= 1 – 10 (3/5) (0.000262144))
= 1 – 0.001572864
= 0.9984

(12b)
Prob (exastly half passed)
= 10C5 (3/5)⁵ (2/5)⁵
= 10!/5!5! (6/25)⁵
= 252 (6/25)⁵
= 252 x 0.0007962624
= 0.2007

(12c)
Prob (at most two failed)
= prob (zero/fail) + prob (one/fail) +prob (two/fail)
= 10C (2/5)º (3/5)10 + 10C (2/5)¹ (3/5)⁹ + 10 C2(2/5)² (3/5)⁸
= (3/5)10 + 10 (2/5) (3/5)⁹ + 45 (2/5)²(3/5)⁸
= 0.060466176 + 0.040310784 + 0.120932352
= 0.1673




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(14a)
Draw the diagram

(14b)
From the diagram
a = v - 20/4
2.5 = v - 20/4
V - 20 = 10
V = 10 + 20 = 30m/s
acceleration/retardation = 3/4
2.5/30/T-12 = 3/4
2.5(T - 12)/30 = 3/4
(T - 12) = 30×3/2.5×4
= 90/10 = 9
T - 12 = 9
T = 9 + 12 = 21
t = T - 12
t = 21 - 12
t = 9secs

(14c)
Total distance of the journey
= Area of BCDI + Area of AFEO + Area of DFI
= 1/2(12+8)10 + 1/2(9×10) + 1/2(21+21)20
= (20/2)10 + 90/2 +(42/2)20
=10(10) + 45 + 21(20)
=100 + 45 + 420
= 565m










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