Question

Simplify the following expression and then find the numerical value for x = -2.

3(2x-4) + x² + 5

Answer 1

After expanding and simplifying the given expression, substituting x = -2 into the equation yields a numerical value of 27.4.

Step-by-step explanation:

To simplify and find the numerical value for the expression given when x = -2, let's first expand the equation:

2.3(2x - 4) + x² + 5

Expanding we get:

-4.6x + 9.2 + x² + 5

Combining like terms:

x² - 4.6x + 14.2

Now, we substitute x = -2 into the simplified expression:

(-2)² - 4.6(-2) + 14.2

4 + 9.2 + 14.2

27.4

The numerical value of the expression when x = -2 is 27.4.