Question

If u^2-c^2=36 and u-c=6, what is u+c

Answer 1

u + c = 6

Explanation:

u² - c² ← is a difference of squares and factors as

u² - c² = (u - c)(u + c) = 36 , thus

6(u + c) = 36 ( divide both sides by 6 )

u + c = 6