Question

13 = root 144 + b^b
$13 = \sqrt{ {12}^{2} + {b}^{2} }$

Answer 1

$13 = \sqrt{144 + {b}^{2} } \\ \\ on \: squaring \: both \: sides \: we \: get \: \\ \\ {13}^{2} = 144 + {b}^{2} \\ \\ 169 = 144 + {b}^{2} \\ \\ {b}^{2} = 169 - 144 \\ \\ {b}^{2} = 25 \\ \\ b \: = \sqrt{25} \\ \\ b = 5$

Answer 2

Hey there!

13 = √ ( 144 + b² )

13² =144 + b²

169 - 144 = b²

25 = b²

b = √25

b = ±5 .

Hope helped!