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OpenStudy (thomasfire55):
If x is a whole number and 437 = (21 + x)(21 - x), then x =
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OpenStudy (thomasfire55):
@mayankdevnani
OpenStudy (welshfella):
the right side can be written as difference of 2 squares 437 = 21^2 - x^2 can you continue from here?
OpenStudy (thomasfire55):
yes
OpenStudy (welshfella):
subtract 21^2 from both sides of the equation is the next step
OpenStudy (welshfella):
OK
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