algebra

Please check my work and correct if necessary. Thank You.

Using factoring and zero-product property, this is my solution for 9^2-30r+21=-4.
9r^2-30r+21=-4
9r^2-30r+25=0
(3r-5)(3r-5)=0
r=5/3

asked by Anneliese
  1. looks good to me

    posted by Steve

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