Question

Solve 2x2 - 8x = -7.

Answer 1

\[ax^2+bx+c\]

Answer 2

Put it in that form first then find A B C values

Answer 3

A.
\[-2\pm \sqrt{2}\]
B.
\[-2\pm2\sqrt{2}\]
C.
\[\frac{ 2\pm \sqrt{2} }{ 2 }\]
D.
\[2\pm \frac{ \sqrt{2} }{ 2 }\]

Answer 4

you can use the quadratic formula

x = [-b +/- sqrt(b^2 - 4ac)] / 2a

Answer 5

A=2, B=-8, and C=7 right? @kidrah69

Answer 6

plug values into the above formula
for your equation b = -8, c = 7 and a = 2

Answer 7

yes

Answer 8

I got
\[x = \frac{ -8\pm \sqrt{120} }{ 4 }\]

Answer 9

@welshfella

Answer 10

but the choices are more simplified

Answer 11

-(-8) +/- sqrt(64-4*2*7)
-------------------
4

Answer 12

= 8 +/- sqrt8
----------
4

Answer 13

note that sqrt8 = 2sqrt2

Answer 14

so we get

8 +/- 2 sqrt2
----------
4

Answer 15

can you simplify that some more?

Answer 16

So it's B?

Answer 17

no

divide 8 by 4 and 2 sqrt2 by 4