Question

Simplify:
\sqrt{28 } + 8\sqrt{63} - 3 \sqrt{7}​

Answer 1

$\sqrt{28} + 8 \sqrt{63} - 3 \sqrt{7} \\ \\ = \sqrt{4 \times 7} + 8 \sqrt{9 \times 7} - 3 \sqrt{7} \\ \\ = 2 \sqrt{7} + 8(3) \sqrt{7} - 3 \sqrt{7} \\ \\ = 2 \sqrt{7} + 24 \sqrt{7} - 3 \sqrt{7} \\ \\ = 26 \sqrt{7} - 3 \sqrt{7} \\ \\ = 23 \sqrt{7}$

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Answer 2

$\longrightarrow\sqrt{28} + 8 \sqrt{63} - 3 \sqrt{7} \\ \longrightarrow \sqrt{7 \times 4} + 8 \sqrt{9 \times 7} - 3 \sqrt{7} \\ \longrightarrow2 \sqrt{7} + 24 \sqrt{7} - 3 \sqrt{7} \\ \longrightarrow26 \sqrt{7 } - 3 \sqrt{7} \\ \underline{\longrightarrow23 \sqrt{7} }$

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