Question

在多项式axxxxx+bxxx+cx-5中,当=-3时,它的值是7,当x=3时,它的值是?

Answer 1

ax^5+bx^3+cx-5中,

当x=-3时,它的值为7;

则a（-3）^5+b（-3)^3+(-3)x-5=7

则a3^5+b3^3-3x=-12

当x=3时它的值是

a3^5+b3^3+3x-5

=-12-5

=-17