Question

А) 125-(5-3x)(25+15x+9x²) при x =-4
Б)127+(5c - 3)(25c²+15c+9) при c=-(1 ) и (5)

Answer 1

125-(5-3x)(25+15x+9x²) =115-(125-27x³)=
115-125+27x³=27x³-10
x=-4
27*(-4)³-10=27*(-64)-10=-1738
127+(5c - 3)(25c²+15c+9) =127+125c³-27=
125c³+100
c=-1
125*(-1)³+100=125*(-1)+100=-25
c=5
125*(5³)+100=125²+100=15725