Factor completely.

5 x2 + 10 x - 40

5(x - 4)(x + 2)
5(x - 2)(x + 4)
5(x - 4)(x - 2)

The product of two negative rational numbers is always zero sometimes zero never zero

What is the vertex form of f(x) = x2 + 6x + 3

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β