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OpenStudy (anonymous):
If x is a whole number and 437 = (21 + x)(21 - x), then x =
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OpenStudy (anonymous):
437 = (21+x)(21-x) Foil (21+x)(21-x)
OpenStudy (anonymous):
441?
OpenStudy (anonymous):
(21+x)(21-x) = (21*21)+(21*-x)+(x*21)+(x*-x)
OpenStudy (anonymous):
(21*x)+(21*-x) cancel since 21x+(-21x) = 0
OpenStudy (paki):
437 = (21 + x)(21 - x) 441-21x+21x-x^2= 437 x^2=441-437 x^2=4 x=2...
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OpenStudy (anonymous):
oh ok, Thank you
OpenStudy (paki):
pleasure
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