SOLUTION: i need help simplifing this equation: -5s^2+11st+9t^2+4(-6s^2+2st+8t^2)

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Question 468812: i need help simplifing this equation:
-5s^2+11st+9t^2+4(-6s^2+2st+8t^2)
Answer by Tatiana_Stebko(1539) About Me  (Show Source):