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
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