Please solve with explanations 144-d^2/21

( 144 - d^2 ) / 21

divide the numerator separately by 21

144 / 21 - d^2 / 21

equate to zero

144 /21 = d ^ 2 / 21

21 of both side get cancel

144 = d ^2

square root of 144

d = 12 answer

Please best my answer thank you .

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