Question 395357
given:

 {{{x = -5}}}....................(1)

 {{{x = -3}}}....................(2)

Add {{{5}}} to both sides of (1)

Add {{{3}}} to both sides of (2)

 {{{x + 5 = 0}}}..................(1)

 {{{x + 3 = 0}}}...................(2)


Their product also = {{{0}}}

{{{(x + 5)(x + 3) = 0}}}

{{{x^2 + 3x + 5x + 15 = 0}}}

{{{x^2 + 8x  + 15 = 0}}}.... answer