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8x^{2}=3\times 8+1
Multiply both sides of the equation by 8.
8x^{2}=24+1
Multiply 3 and 8 to get 24.
8x^{2}=25
Add 24 and 1 to get 25.
x^{2}=\frac{25}{8}
Divide both sides by 8.
x=\frac{5\sqrt{2}}{4} x=-\frac{5\sqrt{2}}{4}
Take the square root of both sides of the equation.
8x^{2}=3\times 8+1
Multiply both sides of the equation by 8.
8x^{2}=24+1
Multiply 3 and 8 to get 24.
8x^{2}=25
Add 24 and 1 to get 25.
8x^{2}-25=0
Subtract 25 from both sides.
x=\frac{0±\sqrt{0^{2}-4\times 8\left(-25\right)}}{2\times 8}
This equation is in standard form: ax^{2}+bx+c=0. Substitute 8 for a, 0 for b, and -25 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{0±\sqrt{-4\times 8\left(-25\right)}}{2\times 8}
Square 0.
x=\frac{0±\sqrt{-32\left(-25\right)}}{2\times 8}
Multiply -4 times 8.
x=\frac{0±\sqrt{800}}{2\times 8}
Multiply -32 times -25.
x=\frac{0±20\sqrt{2}}{2\times 8}
Take the square root of 800.
x=\frac{0±20\sqrt{2}}{16}
Multiply 2 times 8.
x=\frac{5\sqrt{2}}{4}
Now solve the equation x=\frac{0±20\sqrt{2}}{16} when ± is plus.
x=-\frac{5\sqrt{2}}{4}
Now solve the equation x=\frac{0±20\sqrt{2}}{16} when ± is minus.
x=\frac{5\sqrt{2}}{4} x=-\frac{5\sqrt{2}}{4}
The equation is now solved.