Question

(x+7)(x+9)=(x+3)(x+21)​

Answer 1

Answer:

${x}^{2} + 7 \times 9 + 2 \times( 9 + 7) \times (x) = \: try \: to \: do \: same \: as \: lhs \\ thank \: you$

Answer 2

Answer:

X (X + 9) + 7 (x + 9)=X ( X + 21)+3(X+21)