Asked by Jack

Using factoring and zero-product property,please solve the following:


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

Thanks very much.
Answered by Damon
9 r^2 - 30 r + 25 = 0

(3 r -5)(3r-5) = 0
r = 5/3 and 5/3 repeated, parabola just touches r axis
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