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spin [16.1K]
3 years ago
10

Solve for x: 8x-4(-5x-2)=12x

Mathematics
2 answers:
Natali5045456 [20]3 years ago
6 0

Answer:

\frac{-1\±\sqrt{21} }{10}

Step-by-step explanation:

First let's multiply out the equation

8x-4(-5x-2)=12x

-40x^2-16x+20x+8=12x

-40x^2-8x+8

We can't factor so I will use the quadratic formula

\frac{-b\±\sqrt{b^2-4ac} }{2a}

\frac{8\±\sqrt{(-8)^2-4(-40)(8)} }{2(-40)}

\frac{8\±\sqrt{64+1280} }{-80}

\frac{8\±\sqrt{1344} }{-80}

\frac{8\±\ 8 \sqrt{21} }{-80}

\frac{-1\±\sqrt{21} }{10}

Ray Of Light [21]3 years ago
3 0

Answer:

X= -1/2

Step-by-step explanation:

8x-4(-5x-2)=12x

8x+20x+8=12x

28x+8=12x

8=-16x

-1/2=x

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