Question

I need help solving a couple of quadratic equations with complex numbers!

Answer 1

Solve x2 + 4x + 8 = 0
\[x=-2\pm2i\]
\[x=-2\pm4i\]
\[x=-4\pm2i\]
\[x=-4\pm4i\]

Answer 2

Solve x2 - 3x = -8
A. x equals quantity of 3 plus or minus I square root of 29 all over 2
B. x equals quantity of 3 plus or minus I square root of 23 all over 2
C. x equals quantity of negative 3 plus or minus I square root of 29 all over 2
D. x equals quantity of negative 3 plus or minus I square root of 23 all over 2

Answer 3

Do you know the quadratic formula?

Answer 4

Solve -2x2 +3x - 9 = 0
A. x equals quantity of 3 plus or minus 3i square root of 7 all over 4
B. x equals quantity of 3 plus or minus 9i square root of 7 all over 4
C. x equals quantity of negative 3 plus or minus 3i square root of 7 all over 4
D. x equals quantity of negative 3 plus or minus 9i square root of 7 all over 4

Answer 5

Solve 5x2 = -30x - 65
A. x = -3 ± 2i
B. x = -3 ± 4i
C. x = -6 ± 2i
D. x = -6 ± 4i

Answer 6

They come into play because there are no real solutions to your equation. This is clearer when you use the quadratic formula. The term which is inside the root (b^2 - 4ac or the discriminant) is negative.

Answer 7

Solve -2x2 - 16x - 44 = 0
A. x equals negative 8 plus or minus I square root of 6
B. x equals negative 8 plus or minus 2i square root of 6
C. x equals negative 4 plus or minus i square root of 6
D. x equals negative 4 plus or minus 2i square root of 6

Answer 8

never mind I figured it out

Answers
1) A
2) B
3) A
4) A
5) C