Question

Solve 2x2 - 8x = -7 using the quadratic formula

Answer 1

2^2

Answer 2

2x^2 - 8x = -7
2x^2 - 8x +7 = -7 +7
2x2 - 8x +7 = 0
Compare that with ax^2 + bx = c = 0
What is a, b and c?

Answer 3

2 -8 and 7

Answer 4

Yes, apply the quadratic formula to solve x. Quadratic formula:
\[x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\]

Answer 5

i did and i got all the way to \[8\pm √64 - 224 all divided by 4\]

Answer 6

and then i got stuck

Answer 7

What is 4ac ??

Answer 8

where a = 2 and c = 7

Answer 9

4(2)(7) 8 * 28 right? which then equals 224

Answer 10

No!!!
4ac = 4 (2) (7) = 8 (7) = ...?

Answer 11

ohhh ok thanks!

Answer 12

Welcome ._.