Question

(a-3)² + (a-1) (a+9)

Answer 1

${(a - 3)}^{2} + (a - 1)(a + 9) = {a}^{2} - 6a + 9 + {a}^{2} + 8a - 9 = 2 {a}^{2} + 2a = 2a(a + 1)$

Answer 2

(a-3)²+(a-1)(a+9)=

a²-6a+9+a²+9a-a-9=

2a²+2a=2a(a+1)

Answer 3

можешь систему уравнении решить?