Question

Simplify and evaluate 3x(2x-4)-3(x-4)-12 for x=-3

Answer 1

Answer:

99

Step-by-step explanation:

3x(2x-4)-3(x-4)-12

= 6x^2-12x-3x-(-12)-12

= 6x^2-12x-3x+12-12

= 6x^2-15x

For x = -3

6x^2-15x

= 6×-3^2-15×-3

= 6×9-15×-3

= 54- (-45)

= 54+45

= 99

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Answer 2

The value of  $3x( 2x-4)- 3(x-4) -12$  for x=-3 is 99.

Step-by-step explanation:

Given:

$3x( 2x-4)- 3(x-4) -12$

To Find:

The value of $3x( 2x-4)- 3(x-4) -12$  for x=-3.

Solution:

As given - $3x( 2x-4)- 3(x-4) -12 .$

$3x( 2x-4)- 3(x-4) -12 = 6x^{2} -12x -3x+12 -12$

                                            $= 6x^{2} - 15x$

For $x=-3$                           $= 6(-3)^{2} -15(-3)$

                                             $=6 \times 9+ 45$

                                             $=54+45$

                                             $=99$

Thus, The value of  $3x( 2x-4)- 3(x-4) -12$  for x=-3 is 99.