Question

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Answer 1

Explicación paso a paso:

$\\ \\ c) \sqrt{175} + \sqrt{63} - 2 \sqrt{28} \\ \\ = \sqrt{5 {}^{2} \times 7 } + \sqrt{3 {}^{2} \times 7 } - 2 \sqrt{2 {}^{2} \times 7} \\ \\ = 5 \sqrt{7} + 3 \sqrt{7} - 4 \sqrt{7} \\ \\ = 4 \sqrt{7}$