Question

find the value of the polynomial 3 x cube minus 4 x square + 7 x minus 5 when x is equal to -3​

Answer 1

Step-by-step explanation:

3x³ - 4x² +7x -5 =0

(x= -3) put the value

3(-3)³ -4(-3)² +7(-3) -5

3 (-27) - 4 (9) - 21 - 5

- 81 - 36 -21 - 5

-122 - 21

= - 143

Answer 2

Given:

$3x^{3} -4x^{2} +7x-5$

x= -3

To find:

The value of the polynomial

Solution:

The required value of the polynomial is -143.

The value x= -3 will be substituted in the given polynomial to obtain its value.

We know that x= -3

Using the value,

=3$(-3)^{3}$-4$(-3)^{2}$+7(-3)-5

We will solve the brackets and multiply the terms to obtain the value.

=3(-27)-4(9)-21-5

= -81-36-26

= -143

Therefore, the required value of the polynomial is -143.