Question

Find the value of the polynomial 5x-4x2+3 at x=-1. Class 9 question ​

Answer 1

Answer:

$4$

Step-by-step explanation:

$5x - 4 {x}^{2} + 3 = 0$

If x=1,

$5(1) - 4 {(1)}^{2} + 3$

$5 - 4 + 3$

$4$

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Answer 2

Answer:

The value of the polynomial at $x=-1$ is -6.

Step-by-step explanation:

In context to the question asked,

We have to find the value of the polynomial at $x=-1$ or P ( -1 )

As per data given in the question,

The given polynomial,

$P ( x ) = 5x - 4x^2+ 3$

Now, by plugging the value of x as -1:

=> $P(x) = 5x - 4x^2+ 3$

=> $P ( -1 ) = 5 ( -1 ) - 4 ( -1 ) ^2 + 3$

Simplifying it further, we get

=> -5 - 4 + 3

=> -6

Hence, the value of polynomial at $x=-1$ is -6.