Question

$\sqrt{21(21 - 12)(21 - 12)(21 - 18)}$

Note : Root 7 = 2.64

Answer 1

Solution⤵

$= \sqrt{21(21 - 12)(21 - 12)(21 - 18)} \\ = \sqrt{21 \times (9) \times (9) \times (3) } \\ = \sqrt{3 \times 7 \times 3 \times 3 \times 3 \times 3 \times 3} \\ = 3 \times 3 \times 3 \times \sqrt{7} \\ = 27 \sqrt{7}$

$if \: \sqrt{7} = 2.64 \\ then \: \\ = 27 \times 2.64 \\ = 7.28$

= 71.28

Answer = 71.28

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