Given the function:

f (x) = 5x3+8x2-7x-6

Choose 1 of the possible roots and show or describe how you know it is an actual root.

Question

Mathematics

Jeramiah Tucker

20 March, 23:22

Given the function:

f (x) = 5x3+8x2-7x-6

Choose 1 of the possible roots and show or describe how you know it is an actual root.

+2

Answers (2)

Know the Answer?

Pierce Stokes · Answer 1

A=R so,

if x=2, f (2) = 15+16-7*2-6=25-14=11

Was it useful?

Camryn Chang · Answer 2

x = 1 is a root of the polynomial

For any polynomial f (x), if x = a is a root then f (a) = 0

f (1) = 5 + 8 - 7 - 6 = 0

Hence x = 1 is a root of f (x)

Given the function:f (x) = 5x3+8x2-7x-6Choose 1 of the possible roots and show or describe how you know it is an actual root.

Given the function:

f (x) = 5x3+8x2-7x-6

Choose 1 of the possible roots and show or describe how you know it is an actual root.