SOLUTION: Ref. Question 1048321:
(x + 21)^2 = x^2 + 1869
X^2 + 441 = X^2 + 1869
x^2 + 441 - 441 = X^2 + 1869 - 441
x^2 = x^2 + 1428
Stuck here.
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Question 1048398: Ref. Question 1048321:
(x + 21)^2 = x^2 + 1869
X^2 + 441 = X^2 + 1869
x^2 + 441 - 441 = X^2 + 1869 - 441
x^2 = x^2 + 1428
Stuck here.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
(x + 21)^2 = x^2 + 1869
X^2 + 441 = X^2 + 1869 ******* (x+21)^2 = x^2 + 42x + 441
x^2 + 441 - 441 = X^2 + 1869 - 441
x^2 = x^2 + 1428
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