Write the equation for the parabola that has x− intercepts (−2,0) and (1.2,0) and y− intercept (0,−4).

The answer is

Step-by-step explanation:  We are to find the equation of the parabola with x-intercepts (-2,0), (1.2,0) and y-intercept (0,-4).

Therefore, axis of symmetry is

Let the equation of the parabola be

Substituting the points (x,y)=(0,-4) and (1.2,0) in the above equation, we find that

and

Solving the above two equations, we get

So, putting the values of 'a' and 'k' in the equation of the parabola, we get

Thus, the equation of the parabola is  

answer: 180

step-by-step explanation:

12-2=10

20-2=18

18x10=180

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14