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Common Questions Asked in Post UTME Mathematics Exams
Mathematics
Chima Sunday (Tutor)
31-05-2016 11:43:00 +0000Try your best to solve these Questions, show working on paper and include a picture of your hand written Solution in your response. Happy Solving!
1. X*Y = XY - Y2; Evaluate (2x + y)*(y + 2x)
A. 4xy
B. 4x2
C. 0
D. 1Updated Solution
X*Y = XY - Y2
here X = (2x + y), and Y = (y + 2x) = (2x + y)
thus X*Y = (2x + y)(2x + y) - (2x + y)2
= (2x + y)2 - (2x + y)2
= 0, so answer is Option C2. Evaluate x2 + 1/x2 if x - 1/x = 5
A. 24
B. 25
C. 26
D. 27Updated Solution
x2 + 1/x2 = ?
but x - 1/x = 5
now sqauring both side
(x - 1/x)2 = 52
(x - 1/x)(x - 1/x) = 25
x2 + 1/x2 - 2 = 25
x2 + 1/x2 = 25 + 2 = 27
So answer is Option D3. If (2x - 1)(2x + 3) + (2x + 1) = ax2 + bx + c; Find a,b,c
A. 0,6,6
B. 8,0,0
C. 8,0,6
D. 4,6,-2Updated Solution
(2x - 1)(2x + 3) + (2x + 1) = a2 + bx + c
opening the bracket
4x2 + 6x - 2 - 3 + 2x + 1 = ax2 + bx + c 4x2 + 6x - 2 = ax2 + bx + c
so by comparison
a = 4
b = 6
c = -2
so answer is Option D
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Chima Sunday (Tutor)
Majiri E please do check the solutions to the questions above. I appreciate your attempt, keep it up and keep the fire burning.
2 14-06-2016 13:16:00 +0000
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