(5x+3)²=5(x+3)??????????..?....?

Question

(5x+3)²=5(x+3)??????????..?....?

Answer 1

25х²+9=5х+15
25х²-5х=15-9
25х²-5х=4

Answer 2

25x^2+30x+9=5x+15
25x^2+25x-6=0
D= 625+4×6×25=625-600=25=5^2
x1 = -25+5/50= -0,4
x2=-25-5/50=-0,6