SOLUTION: I need some help with simplifying each expression. 1. 18y^2-12y^2 2. (-4x^2-5x+3)-(3x^2+3x-1)+(5x^2-4x+9) 3. -3(y^2+2y-4)-8(2y^2-2y+3)

Question 88892: I need some help with simplifying each expression.
1. 18y^2-12y^2
2. (-4x^2-5x+3)-(3x^2+3x-1)+(5x^2-4x+9)
3. -3(y^2+2y-4)-8(2y^2-2y+3)
Answer by malakumar_kos@yahoo.com(315) (Show Source): You can put this solution on YOUR website!
simplifying each expression.
1. 18y^2-12y^2
2. (-4x^2-5x+3)-(3x^2+3x-1)+(5x^2-4x+9)
3. -3(y^2+2y-4)-8(2y^2-2y+3)

1)18y^2-12y^2 = y^2(18-12) = y^2(6) = 6y^2

2)(-4x^2-5x+3)-(3x^2+3x-1)+(5x^2-4x+9)
= -4x^2-5x+3-3x^2-3x+1+5x^2-4x+9
= -4x^2-3x^2+5x^2-5x-3x-4x+3+1+9
= x^2(-4-3+5)+x(-5-3-4)+(3+1+9)
=x^2(-2)+x(-12)+(13)
= -2x^2-12x+13

3)-3(y^2+2y-4)-8(2y^2-2y+3)
= -3y^2-6y+14-18y^2+16y-24
= -3y^2-18y^2-6y+16y+14-24
= -y^2(3+18)+y(-6+16)+(14-24)
= -21y^2+10y-10
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