A = 3(2x-4)+5(3-x)
= 3×2x+3×(-4)+5×3×5×(-x)
= 6x - 12 + 15 - 5x
= x + 3
B = 2x(5+3x)-4(x+5)
= 2x×5+2x×3x-4×x-4×5
= 10x + 6x² - 4x - 20
= 6x²+6x-20
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A = 3(2x-4)+5(3-x)
= 3×2x+3×(-4)+5×3×5×(-x)
= 6x - 12 + 15 - 5x
= x + 3
B = 2x(5+3x)-4(x+5)
= 2x×5+2x×3x-4×x-4×5
= 10x + 6x² - 4x - 20
= 6x²+6x-20