Question

3x(4x+5) + 3 and find its value for X =-1/2

Answer 1

Answer:

Thus, we get $\frac{3}{2}$

Step-by-step explanation:

We have

$3x(\,4x + 5)\, +3\\\\ 12x^2 + 15x + 3\\\\ 12x^2 + 12x + 3x + 3\\\\ 12x(\,x + 1)\, +3(\,x + 1)\,\\\\ (\,12x + 3)\,(\,x + 1)\,$

When $x = - \frac{1}{2}$

Substituting the value, we get

$(\,12 \times -\frac{1}{2} + 3)\,(\, -\frac{1}{2} + 1)\,\\\\ (\,-6 + 3)\,(\,\frac{1}{2})\,\\\\ 3 \times \frac{1}{2}\\\\ \frac{3}{2}$

Answer 2

Answer:

The correct answer is 3/2 or 1 1/2 is the correct answer.