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WAEC Mathematics Past Questions & Answers - Page 265

1,321.

Expand (2x - 5)(x - 3)

x² - 1x -15

2x² - 11x + 15

2² - 5x - 8

x² - 5x - 15

2x² - 6x + 15

View answer & explanation

Correct answer is B

(2x - 5)(x - 3)
2x $^2$ - 5x - 6x + 15
2x $^2$ - 11x + 15

1,322.

Find the 9th term of the arithmetic progression 18, 12, 6, 0, -6 .........

-54

-30

View answer & explanation

Correct answer is B

18, 12, 6, 0, -6, 12, -18, 24, -30
9th term = -30

1,323.

A boy measured the length and breath of a rectangular lawn as 59.6m and 40.3m respectively instead of 60m and 40m. What is the percentage error in his calculation of the perimeter of the lawn?

10%

1.4%

0.2%

0.1%

View answer & explanation

Correct answer is E

Length = 59.6m Breath = 40.3m Perimeter = (59.6m + 40.3m) x 2 = 99.9 x 2 = 199.8m Actual measurement Perimeter = (60 + 40) x 2 = 100 x 2 = 200m Error = 200m - 199.8m = 0.2 Error =0.2/200 x 100/1 = 0.1%

1,324.

Simplufy Log₁₀4 + Log₁₀25

View answer & explanation

Correct answer is B

Log₁₀4 + Log₁₀25 = Log₁₀(4 + 25)
= Log₁₀100 = Log₁₀10²
= 2Log₁₀10 = 2 x 1 = 2

1,325.

Simplify 56x $^{-4}$ $\div$ 14x $^{-8}$

2x^-12

3x^-3

4x^-4

4x^-3

4x⁴

View answer & explanation

Correct answer is E

$56x^{-4} \div 14x^{-8}$

= $4x^{- 4 - (-8)}$

= $4x^{4}$

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