Question

2(m2 - 2m) - 5(7m-4) and find their values when m= 3​

Answer 1

3m

2

−2m−7=3(2)

2

−2(2)−7 [Putting m=2]

=3×4−2×2−7=12−4−7

=12−11=1.

hope it helps!

Answer 2

$\tt\huge{\blue{Answer:-}}$

$2( {m}^{2} - 2m) - 5(7m - 4)$

$2 {m}^{2} - 4m - 35m + 20$

$2 {m}^{2} - 39m + 20$

Putting value of m=3

$2(3)^{2} - 39 \times 3 + 20$

$2 \times 9 - 117 + 20$

$- 79$