Question

Which of the following are solutions to the equation below?

Check all that apply.

5x^2 - 2x + 16 = 4x^2 + 6x

A. -6

B. 4

C. -4

D. -3

E. 18

F. 6

Answer 1

5x²-2x+16=4x²+6x

5x²-2x+16-4x²-6x=0

x²-8x+16=0

D= b²-4ac

= (-8)²-4×1×16

=0

x=-b/2a

= 8/2

=4

-> B