Question

3 X square + 15 X + 18​

Answer 1

3x sq. + 6x + 9x +18=0

3x(x+2) +9(x+2)=0

(3x+9) (x+2)=0

x=-3,-2

Answer 2

By taking 3 common,

xsquare + 5x + 6 =0

By middle term splitting,

xsquare + 2x + 3x + 6 =0

x ( x + 2 ) + 3 ( x + 2 ) =0

(x+2) (x+3) =0

x = -2 , -3