Question

Answer 1

a) \(=-x^2+3x+10+x^2-6x+9-6x+12=-9x+31\)

b) \(=-y^2+y+12+y^2-8y+16-6y+10=-13y+38\)

Answer 2

a/ $=-x^2+3x+10+x^2-6x+9-6x+12\\=-9x+31$

b/ $=-y^2+y+12+y^2-8y+16-6x+10\\=-13y+38$

Answer 3

a) \(\left(x+2\right)\left(5-x\right)+\left(x-3\right)^2-3\left(2x-4\right)\)

\(=\left(5x-x^2+10-2x\right)+\left(x^2-6x+9\right)-\left(6x-12\right)\)

\(=5x-x^2+10-2x+x^2-6x+9-6x+12\)

\(=-11x+31\)