Question

Ayúdenme a resolverlo y si gfecita será eterna :'(​

Answer 1

$130 { }^ { 2} = b {}^{2} + 12 {}^{2}$

$17030 = b {}^{2} + 144$

$16886 = b {}^{2}$

$\sqrt{16886 } = b$

b=129,9