Question

If m = 2, find the value of: (i) m – 2 (ii) 3m – 5 (iii) 9 – 5m (iv) 3m2 – 2m – 7 (v) $\frac{5m}{2}$-4

Answer 1

(i) m-2 = 2-2 = 0 [putting m = 2]

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(ii) 3m-5 = 3×2-5 = 6-5 = 1 [putting m = 2]

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(iii) 9-5m = 9-5×2 = 9-10 = -1 [putting m = 2]

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(iv) 3m2-2m-7 = 3(2)2-2(2)-7 = 3×4-2×2-7 = 12-4-7 = 12-11=1 [putting m = 2]

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(v) $\frac{5m}{2}$-4 = $\frac{5\times 2}{2}$-4 = 5-4 = 1 [putting m = 2]