Answer:
Step-by-step explanation:
3x² +6x = 45
divid by : 3 :
x² +2x = 15
(x² +2x +1 )-16 = 0
( x + 1 )² - 4² = 0
note : a² - b² = (a - b ) ( a + b) ...idetity
( x +1 -4)( x + 1 +4) = 0
(x -3 ) ( x+5) =0
x-3 = 0 or x +5 = 0
x = 3 or x = - 5
my answer in the boxes : x = 3 and x = -5
