Question

Can someone help me step by step !!

Answer 1

`x=√(153)`

Explanation:

`(\overline{BC})^2 = (\overline{AB})^2 + (\overline{AC})^2\\\\(13)^2=(x)^2+(4)^2\\\\169 = x^2+16\\\\169-16=x^2\\\\153=x^2\\\\√(x^2) = √(153)\\\\x=√(153)`