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= (5^2)(-2)+5(-2)^2
= 25(-2)+5+4
= -50+9
= -41
2. 3x^2+4x-2xy-2x^2-x+2xy
= 3x^2-2x^2+4x-x-2xy+2xy
= x^2+3x
3. x^2+6x+8
= (x+4)(x+2)