Question

How do you factor `-2x ^ { 2} - 13x + 45`?

Answer 1

`−2x^2−13x+45`

find factors of -90 (45 x -2), which when added give -13.

`=>−2x^2−18x+5x+45`

`=>−2x(x+9)+5(x+9)`

`=>(-2x+5)(x+9)`