Question

How do you solve by factor `5x^2 + 20x + 20 = 0`?

Answer 1

`x=-2`

Explanation:

`"take out a "color(blue)"common factor 5"`

`rArr5(x^2+4x+4)=0larrcolor(blue)"factor the quadratic"`

`"the factors of + 4 which sum to + 4 are + 2 and + 2"`

`rArr5(x+2)(x+2)=0`

`rArr5(x+2)^2=0`

`rArrx+2=0`

`rArrx=-2" is the solution"`