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Find two numbers (exactly) whose product is 72 and whose sum is 25.
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Ok. Lets call one number x
If the sum of both of them is 25, how would we find the other number?
25- minus the number we don't know, or 25-x, right
If their product is 72, then we know the first number -x times the second, 25-x, =72, or x(25-x)=72
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