Question

if 4x^3+8x^2-x-2=0 then value of 2x+3 is??

Answer 1

Given: The polynomial 4x³ + 8x² - x - 2 = 0

To find: The value of 2x + 3 ?

Solution:

• Now we have given the equation as:  

                4x³ + 8x² - x - 2 = 0

• Taking common terms, we get:

                4x²(x + 2) - 1(x + 2) = 0

                (x + 2)(4x² - 1) = 0

                (x + 2)(2x - 1)(2x + 1) = 0

• From this, the value of x is:

                x = -2 , 1/2 and -1/2

• Putting this in 2x + 3, we get:

                x = -2, we get:

                2(-2)+3 = -4 + 3 = -1

                 x = 1/2, we get:

                2(1/2) + 3 = 1 + 3 = 4

                x = -1/2, we get:

                2(-1/2) + 3 = - 1 + 3 = 2

Answer:

            So the values of 2x + 3 are -1, 2 and 4.

Answer 2

Do look upon this attachment

I hope it helped u...