Question

In this
1.answer=16
2.answer=651
pls tell me the steps...

Answer 1

${(a + b + c)}^{2} = {a}^{2} + {b}^{2} + {c}^{2} + 2(ab + bc + ac) \\ \\ a + b + c = \sqrt{250 + 6 } = \sqrt{256} = 16$
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Answer 2

my answer is 671
pls check