Question

como que faz isso ae

Answer 1

a)

(x²-2)*(3x⁴-10x²+1x²)=

(x²-2)*(3x⁴-9x²)=

x²*(3x⁴-9x²) -2*(3x⁴-9x²)

=3x⁶-9x⁴-6x⁴+18x²

=3x⁶-15x⁴+18x²

b)

(x-y-5)*(2x-5y-1)

x*(2x-5y-1)-y*(2x-5y-1)-5*(2x-5y-1)

=2x²-5xy-x-2xy+5y²+y-10x+25y+5

=2x²-7xy+5y²-11x+26y+5

c)

(x-3)*(-x²+4x+4)

x*(-x²+4x+4) -3*(-x²+4x+4)

=-x³+4x²+4x+3x²-12x-12

=-x³+7x²-8x-12