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horrorfan [7]
3 years ago
13

Need help will give you a good rating us

Mathematics
1 answer:
vovikov84 [41]3 years ago
4 0

Answer:

\boxed{2\pm \frac{\sqrt{2}}{2}}

Step-by-step explanation:

2x^2-8x=-7

\sf Add \ 7 \ on \ both \ sides}.

2x^2-8x+7=-7+7

2x^2-8x+7=0

ax^2 +bx+c=0

\sf Apply \ quadratic \ formula.

a=2 \ \ \  b=-8 \ \ \ c = 7

x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}

x=\frac{-(-8)\pm\sqrt{(-8)^2-4(2)(7)}}{2(2)}

x=\frac{8\pm\sqrt{64-56}}{4}

x=\frac{8\pm\sqrt{8}}{4}

x=\frac{8\pm2\sqrt{2}}{4}

x=2\pm \frac{\sqrt{2}}{2}

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