(2-3x)kwadrat-(-4x+5)kwadrat=
(2-3x)²-(-4x+5)²=2²-2*2*3x+(3x)²-[(-4x)²+2*-4x*5+5²]=4-12x+9x²-(16x²-40x+25)
=4-12x+9x²-16x²+40x-25=-7x²+28x-21
(2-3x)^2-(-4x+5)^2=4+12x-9x²-(16x²-40x+25)=4+12x-9x²-16x²+40x-25=-7x²+28x-21
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(2-3x)²-(-4x+5)²=2²-2*2*3x+(3x)²-[(-4x)²+2*-4x*5+5²]=4-12x+9x²-(16x²-40x+25)
=4-12x+9x²-16x²+40x-25=-7x²+28x-21
(2-3x)^2-(-4x+5)^2=4+12x-9x²-(16x²-40x+25)=4+12x-9x²-16x²+40x-25=-7x²+28x-21