Asked by Anneliese
Please solve the following problem by using factoring and the zero-product property.
9r^2-30r+21=-4
Thanks
9r^2-30r+21=-4
Thanks
Answers
Answered by
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
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
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