Question

Solve the equation by factoring: -3x^2+18x+21=0.

What are the solutions to the equation?

A. -7, 1
B. 3, -2
C. 7, -1
D. -3, 2

Answer 1

Step-by-step explanation:

-3x^2 +18x+21=0

-3x^2 +21 x -3x +21 =0

-3x(x-7) -3(x-7) =0

(-3x-3)(x-7)=0

if -3x-3 =0, x= -1

×-7=0, x=7

solutions are 7 and-1