Recognize as difference of squares: Recognize the expression as a difference of squares.(49−x2)−(a2+2ax)
Rewrite each square: Rewrite each square.(72−x2)−(a2+2ax)
Factor each difference of squares: Factor each difference of squares.(7−x)(7+x)−(a+x)2
Correct grouping of terms: Realize there's a mistake; the second term is not a difference of squares.Go back to the original expression and group terms correctly.(49−a2)−(2ax+x2)
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