Question

If m=3 and n=2 find the value of (i) 9m2– 10 n3(ii) 2m2n2(iii) 2m3+3n2-5m2n(iv) mn– nm

Answer 1

Given :

m = 3

n = 2

1) 9 m² - 10 n³ = 9 × 3² - 10 × 2³ = 9 × 9 - 10 × 8 = 81 - 80 = 1

2) 2 m² n² = 2 × 3² × 2² = 2 × 9 × 4 = 72

3) 2 m³ + 3 n² - 5 m²n = 2 × 3³ + 3 × 2² - 5 × 3² × 2 = 2 × 27 + 3 × 4 - 5 × 9 × 2 = 54 + 12 - 90 = -24

4) mn - nm = 3 × 2 - 2 × 3 = 6 - 6 = 0

hope it helps !!