Question

if a = -7, find the value of a^2 -3a​

Answer 1

Answer:

${a}^{2} - 3a \\ \\ put \: a = - 7 \\ \\ { - 7}^{2} - 3( - 7) \\ \\ 49 + 21 \\ \\ 70$

Answer 2

Refer attachement

Remember that :

minus × minus = plus

May u have a good day ahead :)