Question

Use an expansion formula to find the values
A) (97) sq. I used
(90+7) square
Please tell next step fast

Answer 1

$(a + b) {}^{2} = a {}^{2} + 2ab + b {}^{2}$


(90+7) square=90*90+2*90*7+7*7=
8100+1260+49=
9409