Ivan can paint 25 square feet every half hour. How many square feet can he paint in 3 hours?
3 answers:
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from notable products:
A² - B² = (A + B)·(A - B)
bringing to our problem:
9 - G² = (3 + G)·(3 - G)
Factoring 24G + 8G²:
8G(3 + G)
So, we have:
{G²/[ (3 + G)·(3 - G)]} + {(14 + G)/[8G(3 + G)]}
So the least common denominator is: 3 + G