Evaluate
2\sqrt{23}\approx 9.591663047
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\sqrt{64-4\times 7\left(-1\right)}
Calculate 8 to the power of 2 and get 64.
\sqrt{64-28\left(-1\right)}
Multiply 4 and 7 to get 28.
\sqrt{64-\left(-28\right)}
Multiply 28 and -1 to get -28.
\sqrt{64+28}
The opposite of -28 is 28.
\sqrt{92}
Add 64 and 28 to get 92.
2\sqrt{23}
Factor 92=2^{2}\times 23. Rewrite the square root of the product \sqrt{2^{2}\times 23} as the product of square roots \sqrt{2^{2}}\sqrt{23}. Take the square root of 2^{2}.
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