Question

ALG 2 Quadratic Formula / Completing the Square
What are the solutions of 2x^2 – 6x = –8?
a) -4 ± i√26 ÷ 8
b) -1 ± i√5 ÷ 2
c) -1 ± 2i√2
d) 3 ± i√7 ÷ 6

Answer 1

none of the above

Answer 2

they are
\[\frac{3\pm\sqrt{7}i}{2}\]

Answer 3

that's what i thought but it is multiple choice and my answer was 3 ± i√7 ÷ 2

Answer 4

your answer is right. it matches none of the above

Answer 5

Thanks, so I'm just gonna go with d, maybe they messed up putting the answer choices in...

Answer 6

2x^2 – 6x = –8? ; /2

x^2 -3x = -4 ; complete square

(x-3/2)^2 = -16+9/4

x = 3/2 +- sqrt(-7)/2 ..... maybe