Question

Solve 2x2 - 8x = -7

Answer 1

@kewlgeek555

Answer 2

@tHe_FiZiCx99

Answer 3

2x^2 - 8x = -7 ?

Answer 4

yes!

Answer 5

Hm, I mean if you're trying to solve for x, you'd get rid of the square and square root both sides,

2x - 8x = √7

-6x = √7
/-6 /-6

x = √7/-6 ??

Answer 6

@wio

Answer 7

are you given options?

Answer 8

yes hold on!

Answer 9

negative 2 plus or minus square root of 2

negative 2 plus or minus 2 square root of 2

quantity of 2 plus or minus square root of 2 all over 2

2 plus or minus square root of 2 end root over 2

Answer 10

I'm in between C or D >.<

Answer 11

I don't understand

Answer 12

I just woke up so I see random number >_> but its not negative 2, least what i did on paper it can't be negative

Answer 13

\[
2x^2 - 8x = -7
\]Divide by 2\[
x^2-4x=-\frac72
\]Complete the square: \[
(x-2)^2-4=-\frac 72
\]Add \(4\):\[
(x-2)^2=\frac12
\]Square root: \[
|x-2| = \frac1{\sqrt 2}
\]So we have two equations: \(x-2=1/\sqrt2\) and \(-(x-2)=1/\sqrt2\)

Answer 14

2(plus or minus)√2/2

Answer 15

how about If a baseball player hits a baseball from 4 feet off the ground with an initial velocity of 64 feet per second, how long will it take the baseball to hit the ground? Use the equation h = -16t2 + 64t + 4. ?

Answer 16

Ahh this is quadratic :D I knew I was missing something >.>