Let f(x)=2x^4+x^3+x^2-3x+r. For what value of r is f(2)=0?

Question

asked Jul 12, 2021 164k views

2 Answers

David Rutherford · Answer 1 · 2021-07-17T14:20:13+0000

Answer:

r = -38

Explanation:

For what value of r in the formula: f(x) = 2x4 + x3 + x2- 3x + r does f(2) = 0?

Replace x with 2: 2·24 + 23 + 22- 3·2 + r = 32 + 8 + 4 - 6 + r = 38 + r

This value is to equal 0: 38 + r = 0

r = -38