Question

$2 \sqrt{81 + 7} =$
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Answer 1

Răspuns:

=

Explicație pas cu pas:

$2 \sqrt{81 + 7} = 2 \sqrt{88} = 2 \times 2 \sqrt{22} = 4 \sqrt{22}$

Answer 2

$81+7=88\\\sqrt{81+7}=\sqrt{88}=\sqrt{4*22}=\sqrt{2^2*22}=2\sqrt{22}     \\2\sqrt{81+7}=2*2\sqrt{22}  =4\sqrt{22} \\4\sqrt{22}=\sqrt{4^2*22}=\sqrt{16*22}=\sqrt{352}$