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Question

Please solve the following problem by using factoring and the zero-product property.

9r^2-30r+21=-4


Thanks
8 years ago

Answers

Steve
9r^2-30r+21 = -4
9r^2-30r+25 = 0

Note that 9 and 25 are perfect squares, so a good thing to try is

(3r-5)^2 = 0

Yep, that's it.

So, there is a double root of x = 5/3
8 years ago

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