How for can a car run for (7x-2y)hours at (49x2+14xy+4y2)kilometers per hour?
Time = (7x-2y) hours Rate = (49x2+14xy+4y2) kilometers per hour The formula is Distance = Rate × Time Distance = (49x2+14xy+4y2)(7x-2y) Now simplify this: If you switch the factors (7x-2y)(49x2+14xy+4y2) and recognize this as the factorization of (7x)3-(2y)3, then you'll know this is the answer. Otherwise, multiply it all the way out and everything will cancel except 343x3-8y3, which = (7x)3-(2y)3. Edwin
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