Question

find the value of the polynomial 5x - 4x^2 + 3 when x = -2​

Answer 1

Answer:

$5x - 4x {}^{2} + 3 \\ 5( - 2) - 4( - 1)( - 1) + 3 \\ - 10 - 4 + 3 = 11$

hence the value of polynomial is 11 when x= -2

Answer 2

If x = - 2 then the value of the polynomial 5x - 4x² + 3 is - 23

Given :

The polynomial 5x - 4x² + 3

To find :

The value of the polynomial 5x - 4x² + 3 when x = - 2

Solution :

Step 1 of 2 :

Write down the given polynomial

Let p(x) be the given polynomial

Then we have

p(x) = 5x - 4x² + 3

⇒ p(x) = - 4x² + 5x + 3

Step 2 of 2 :

Find the value of the polynomial when x = - 2

The value of the polynomial when x = - 2

$\sf= p(-2)$

$\displaystyle \sf{ = - 4 \times {( - 2)}^{2} + 5 \times ( - 2) + 3 }$

$\displaystyle \sf{ = (- 4 \times 4) - 10 + 3 }$

$\displaystyle \sf{ = - 16 - 10 + 3 }$

$\displaystyle \sf{ = - 23 }$

━━━━━━━━━━━━━━━━

Learn more from Brainly :-

$1.$ If p(x) = 2x + 1, then find p( -1)

https://brainly.in/question/20224817

2. if polynomial p(t)=t⁴-t³+t²+6,then find p(-1)

https://brainly.in/question/3539645