Question

if m=2 find the value of
$3 {m - 2m - 7}^{2}$
​

Answer 1

3m2−2m−7=3(2)2−2(2)−7  [Putting m=2]

=3×4−2×2−7=12−4−7

=12−11=1.

Answer 2

3m − 2m − 7 = 3(2) − 2(2) − 7 [Putting m=2]
= 3 × 4 − 2 × 2 − 7 = 12 − 4 − 7
= 12 − 11 = 1.