Solve for y
y=2\left(\sqrt{42}-4\right)\approx 4.961481397
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y+8=2\sqrt{42}
Factor 168=2^{2}\times 42. Rewrite the square root of the product \sqrt{2^{2}\times 42} as the product of square roots \sqrt{2^{2}}\sqrt{42}. Take the square root of 2^{2}.
y=2\sqrt{42}-8
Subtract 8 from both sides.
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