Question

(7a-5b) (7a-5b)
solve​

Answer 1

Answer:

49(a^2)+25(b^2)-70ab

Step-by-step explanation:

(a-b)^2 formula

Answer 2

$\bf{(7a - b)(7a - b) =( 7 {a})^{2} - 7ab - 7ab + ({ - b})^{2}} \\ \\ \\ \boxed{\bf{hence \rightarrow 49 {a}^{2} - 14ab + {b}^{2}} } \\ \\ \\ \huge\boxed{\bf{identity\: used\rightarrow a²-2ab+b²}}$