Replace x with 10 and solve for the two sides:
6(10)+4 = 64
5(10) = 50
Now use the Pythagorean theorem to find the hypotenuse:
SQRT(50^2 + 64^2)
SQRT(2500 + 4096)
SQRT(6596) = 2sqrt(1649) = 81.215
Exact length = 2sqrt(1649)
As a decimal = 81.215
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