Question

Oblicz:
a) -1/4 (2x-4)² - (x+y) (y-x)
b) -(x-3)² - 3(x-1)(x+3)
c) -5x(2-x)

Answer 1

C) -5x(2-x)
-10x + 5x²

Answer 2

A) -1/4(4x² - 16x + 16) - (xy - x² + y² - xy) = -x² + 4x - 4 + x² -y² = 4x - 4 - y²

Answer 3

A) -14(4x2-16x+16)-(- x2 + y2)= -x2+4x-4+x2-y2= -y2+4x-4
b)-(x2-6x+9)-3(x2-4x-3)=-x2+6x-9-3x2+12x+9=-4x2+18x
c-5x(2-x)=-10x+5x2