Question

If x is a whole number and 437 = (21 + x)(21 - x), then x = __________

Answer 1

@calculusxy @ganeshie8 @Michele_Laino

Answer 2

@Vocaloid

Answer 3

1st we open the brackets
\[437=21^2-x^2\]\[437=441-x^2\]\[x^2=4\]\[x=\pm 2\]but since x is a whole number x= +2