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x²-9 > (x²-2x+2x-4) (1,5x-4)
x²-9 > 1,5x³-4x²-3x²+8x+3x²-8x-6+16
x²-9 > 1,5 x³-4x²+10
b)x²+6x+9>(x-1)(x+2)+1
x²+6x+9 > x²+2x-x-2+1
x²+6x+9 > x²+x-1 / -x²