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solve with explanations 144-d^2/21

Algebra
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Please solve with explanations  144-d^2/21

Jul 11th, 2014


   ( 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 . 

Jul 11th, 2014

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