Question

How do you factor completely `3x^2 + 4x -15`?

Answer 1

`color(white)xx3x^2+4x-15=3(x-5/3)(x+3)`

Explanation:

`color(white)xx3(x-5/3)(x+3)=3(x^2+3x-(5x)/3-5)`
`color(white)(xxxxxxxxxxxxxx)=3(x^2+(9x-5x)/3-5)`
`color(white)(xxxxxxxxxxxxxx)=3x^2+4x-15`