A=(x+7)(3-2x)+(5x-2)(4x+1)
A=3x-2x²+21-14x+20x²+5x-8x-2
A=-2x²+20x²+3x-14x+5x-8x+21-2
A=18x²-14x+19
B=(2x+3)(5x-8)-(2x-4)(5x-1)
B=10x²-16x+15x-24-10x²+2x+20x-4
B=10x²-10x²-16x+15x+2x+20x-24-4
B=21x-28
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A=(x+7)(3-2x)+(5x-2)(4x+1)
A=3x-2x²+21-14x+20x²+5x-8x-2
A=-2x²+20x²+3x-14x+5x-8x+21-2
A=18x²-14x+19
B=(2x+3)(5x-8)-(2x-4)(5x-1)
B=10x²-16x+15x-24-10x²+2x+20x-4
B=10x²-10x²-16x+15x+2x+20x-24-4
B=21x-28