Answer:
A,-11x⁴+2x³+4x²-5x
B,6x²-x²-35x
C3x⁶-2x⁵+6x⁴+3x³+14x
Explanation:
A,(3x²-5x-7x⁴)-(-2x³+4x⁴-x²)
3x²-5x-7x⁴+2x³-4x⁴+x²
3x²+x²-5x-7x⁴-4x⁴+2x³
4x²-5x-11x⁴+2x³ when we order the deegrees from large to small is=
-11x⁴+2x³+4x²-5x
B,(3x²+7x)(2x-5)
3x²(2x-5)+7x(2x-5)
6x³-15x²+14x²-35x
6x³-x²-35x
C,(3x³-2x²+7)(x³+2x)
3x³(x³+2x)-2x²(x³+2x)+7(x³+2x)
3x⁶+6x⁴-2x⁵-4x³+7x³+14x
3x⁶-2x⁵+6x⁴-4x³+7x³+14x
3x⁶-2x⁵+6x⁴+3x³+14x
i think my answer is clear but if you have any question about these answers you can ask me