21.(3x+7)(3-2x)
=9x-6x²+21-14x
=-6x²-5x+21
22.
(4x+5)(-4x+2)
-4x²
23.
(3x-2)(5+6x)
=15x+18x²-10-12x
=18x²+15x-12x-10
24. (-5+2x)(-3+7x)
=15-35x-6x+14x²
=14x²-41x+15
25.
(x+3)(x³-2x²+3)
=x⁴-2x³+3x+3x³-6x²+9
=x⁴+x³-6x²+3x+9
26.(x-5)(3x-x²+x³)
=3x²-x³+x⁴-15x+5x²-5x³
=x⁴-6x³+3x²-15x
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Answers & Comments
21.(3x+7)(3-2x)
=9x-6x²+21-14x
=-6x²-5x+21
22.
(4x+5)(-4x+2)
-4x²
23.
(3x-2)(5+6x)
=15x+18x²-10-12x
=18x²+15x-12x-10
24. (-5+2x)(-3+7x)
=15-35x-6x+14x²
=14x²-41x+15
25.
(x+3)(x³-2x²+3)
=x⁴-2x³+3x+3x³-6x²+9
=x⁴+x³-6x²+3x+9
26.(x-5)(3x-x²+x³)
=3x²-x³+x⁴-15x+5x²-5x³
=x⁴-6x³+3x²-15x