JAMB - Mathematics (1990 - No. 12)

If a = 2, b = -2 and c = -\(\frac{1}{2}\), evaluate (ab2 - bc2)(a2c - abc)
2
-28
-30
-34

Explanation

(ab2 - bc2)(a2c - abc)

[2(2)2 - (- 2x\(\frac{1}{2}\))] [22(-\(\frac{1}{2}\)) - 2(-2)(-\(\frac{1}{2}\))]

[8 = \(\frac{1}{2}\)][-2 - 2] = \(\frac{17}{2}\) x 42

= -34

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