Question

Please help me with this question I'll mark you as the BRAINLIEST

Answer 1

$\sqrt{10 - 2 \sqrt{21} } + \sqrt{8 + 2 \sqrt{15} } = \sqrt{7 + 3 - 2 \sqrt{7 \times 3} } + \sqrt{5 + 3 + 2 \sqrt{5 \times 3} } = \sqrt{ {(7 - 3)}^{2} } + \sqrt{(5 + 3) {}^{2} } = 4 + 8 = 12$