Question

How do you multiply (5+x)(3−2x)?

Answer 1

(5+x)(3 -2x )

5 (3-2x)+x (3-2x)

15-10x+3x-2x2

15-7x-2x2

Answer 2

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

5(3-2x)+x(3-2x)=0

15-10x+3x-2x^2=0

15-7x-2x^2=0

-2x^2-7x+15=0

2x^2+7x-15=0

2x^2+10x-3x-15=0

2x(x+5)-3(x+5)=0

(2x-3)(x+5)=0

2x-3=0 or x+5=0

2x=3 or x=-5

x=3/2 or x=5