Find x. A. 2√5 B. 3√5 C. 6

asked Oct 28, 2020 183k views

4 votes

Find x.

A. 2√5
B. 3√5
C. 6

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5 votes

Answer: C

Explanation:

By the geometric mean theorem,

$(y)/(5)=(4)/(y)\\ \\ y^(2)=20\\\\y=√(20)$

So, by the Pythagorean theorem,

$4^(2)+(√(20))^(2)=x^2\\\\36=x^2\\\\x=\boxed{6}$

Giogadi answered Nov 3, 2020

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