Answer:
- p(-5) = -495
- p(15) = 18285
Step-by-step explanation:
You want the value of p(x)=5x^3+6x^2+4x for x=-5 and x=15.
Horner form
Writing a polynomial in Horner form can simplify evaluation.
p(x) = ((5x +6)x +4)x
p(-5)
p(-5) = ((5(-5) +6)(-5) +4)(-5) = (-19(-5) +4)(-5) = 99(-5) = -495
p(15)
p(15) = ((5(15) +6)(15) +4)(15) = (81(15) +4)(15) = 1219(15) = 18285
