Question

Find the value of following polynomial by taking $x=1$ and $a=2$:
$3x^4-a{x}^3+5x-3$

• A. $2$
• B. $3$
• C. $-3$
• D. $5$

Answer 1

Answer: (B)

$3$

We simply substitute $x=1,a=2$ in the given polynomial $3x^4-a{x}^3+5x-3$ as shown below:

$3x^4-a{x}^3+5x-3=3(1{)}^4-2(1{)}^3+5\left(1\right)-3=3-2+5-3=3+5-2-3=8-5=3$

Hence, the value of the polynomial$3x^4-a{x}^3+5x-3=3$ when $x=1,a=2$.