Question
Find the polynomial having roots at $ \dfrac{ 5 }{ 4 } $ , $ -4 $ and $ \dfrac{ 1 }{ 4 } $ .
Answer
The polynomial generated from the given zeros is: $ P(x) = 16x^3+40x^2-91x+20 $
Explanation
Step 1: Turn the zeros into factors:
| Zero | Factor |
| $ \dfrac{ 5 }{ 4 } $ | $ 4x-5 $ |
| $ -4 $ | $ x+4 $ |
| $ \dfrac{ 1 }{ 4 } $ | $ 4x-1 $ |
Step 2: Multiply the factors together:
$$ P(x) = \left( 4x-5 \right) \cdot \left( x+4 \right) \cdot \left( 4x-1 \right) = 16x^3+40x^2-91x+20 $$This page was created using
Polynomial From Roots Calculator