simplify (9w^2+9 w-1)-(-w^2-6w+8)+(-5w^2+6w+5)=
(9w^2+9 w-1)-(-w^2-6w+8)+(-5w^2+6w+5) = 9w^2+9 w-1+w^2+6w-8-5w^2+6w+5 = (9w^2+w^2-5w^2)+(9w+6w+6w)+(-1-8+5) = 5w^2+21w-4
Question
Updated 9/22/2014 8:14:55 PM
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(9w^2+9 w-1)-(-w^2-6w+8)+(-5w^2+6w+5)
= 9w^2+9 w-1+w^2+6w-8-5w^2+6w+5
= (9w^2+w^2-5w^2)+(9w+6w+6w)+(-1-8+5)
= 5w^2+21w-4
Confirmed by andrewpallarca [9/23/2014 4:19:14 AM]

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