Question

Pls. Urgent. Dau coroana​

Answer 1

(x+y) -3 (x-2y) -5x= x+y-3x+6y-5x=x+y-3x+6y-5x= -7x+7y

(x+2) + 2(x²-3x)-3x²=x+2+2x²-6x-3x²= -x²-5x+2

(x+2)²-(x-2)²+4(2x+1)= (x²+2*2x+2²)-(x²-2*2x+2²) +8x+4 = x²+4x+4-x²+4x-4+8x+4= 16x+4

formule folosite:

(a+b)²=a²+2ab+b²

(a-b)²=a²-2ab+b²

Answer 2

1.) (x+y)+3(x-2y)-5x=-x-5y
2.)(x+2)^2+2(x^2-3x)-3x^2= -x^2-5x+2
3.)(x+2)^2-(x-2)^2+4(2x+1)= 16x+4