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4a-5x-(2a-x)=4a-5x-2a+x=2a-4x
(x-1)(x+3)=x²+3x-x-3=x²+2x-3
2z(4+3z)=8z+6z²=6z²+8z
b) 4a - 5x - (2a -x) = 4a - 5x -2a +x = 2a -4x = 2 (a - 2x)
d) (x-1)(x+3) = + 3x -x -x = + 2x -3 = x ( x+2) -3
c) 2z (4 +3z) = 8z + 6 = z (8 +6z)