Question

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Answer 1

Answer:

Step-by-step explanation:

Use the standard form equation along with 3 of the coordinates from the table. I used (-1, 2.5), (0, 5), and (1, 8.5). Begin always with the coordinate where you have a 0:

$5=a(0)^2+b(0)+c$ and we get immediately that c = 5. We can use that value as move forward with the next coordinate pair.

$8.5=a(1)^2+b(1)+5$ and

8.5 = a + b + 5 and

3.5 = a + b Hold that thought while we come up with the second equation for this system.

$2.5=a(-1)^2+b(-1)+5$ and

2.5 = a - b + 5 and

-2.5 = a - b  Now solve this system using the method of eliination:

  a  +  b  =  3.5

+ a  -  b  = -2.5

so

2a = 1 and a = 1/2 Now we can plug that in and solve for b:

a + b = 3.5 becomes

1/2 + b = 3.5 so

b = 3 and the equation is

$y=\frac{1}{2}x^2+3x+5$