Express y=-2x^2+28x-26 in factored form, y=-9x^2+72+81 in ve

[buddy]

3. Express y= -2x^2 + 28x-26 in factored form
6. Express y= -9x^2 + 72x +81 in vertex form

help plz!!!

[stapel_eliz]

Where are you stuck? Which part is causing you difficulty?

3. Express y= -2x^2 + 28x-26 in factored form

What factor is common between -2, 28, and -26? (Yes, take the "minus" sign, too; it'll make the rest easier.)

Then factor the remaining quadratic. Hint: What factors of 13 add up to -14?

6. Express y= -9x^2 + 72x +81 in vertex form

To put this into "y = a(x - h)² + k" form, you'll need to complete the square.

If you get stuck, please reply showing all your steps. Thank you!

[buddy]

3. -2 is the common factor? so i get -2(x^2+14-13), but i cant factor this?
4. -9(x^2+72x)+81 but i dont knoe what to do next?

[stapel_eliz]

3. -2 is the common factor? so i get -2(x^2+14-13), but i cant factor this?

Try slowing down and doing your steps more explicitly when you factor. Inside the parentheses, you've dropped an "x" and have lost track of some signs!

. . . . .-2x² = -2(x²)
. . . . .28x = -2(-14x)
. . . . .-26 = -2(13)

So what should you get, when you take a -2 out of -2x² + 28x - 26?

4. -9(x^2+72x)+81 but i dont knoe what to do next?

First, check your factorization. It doesn't look like you took the -9 out of the 72x in the middle...?

[buddy]

i figured t out thnx