(b+3)(b-7) = b^2 - 7b + 3b - 21(b+3)(b-7) = b^2 - 4b - 21
Comparing this with b^2 - 49, we see that b^2 - 4b - 21 is not equal to b^2 - 49. This means that the given equation is not true as it stands.
(b+3)(b-7) = b^2 - 7b + 3b - 21
(b+3)(b-7) = b^2 - 4b - 21
Comparing this with b^2 - 49, we see that b^2 - 4b - 21 is not equal to b^2 - 49. This means that the given equation is not true as it stands.