Question

having trouble writing functions in a((x-h)^2)+k

Write the quadratic function in the form, and give the vertex of its graph.

g(x)= (2x^2)-12x+15

Answer 1

2((x^2)-6x)+15

Answer 2

2((x^2)-6x+((-6/2)^2))+15

Answer 3

2((x^2)-6x+9)+15+18

Answer 4

i get stuck when completing the square (b/2)^2 and adding to the right side

Answer 5

I assume you know what a "perfect square trinomial" is?

Answer 6

ax^2+bx+c

Answer 7

well... that would be a quadratic equation in standard form only

Answer 8

http://www.youtube.com/watch?v=tYv-Pchyu0Y

Answer 9

\[2(x^2-6x+___)+15\]
\[2(x^2-6x+9)+15-18\]

Answer 10

so should be
\[2(x-3)^2-3\]

Answer 11

:0)

Answer 12

ok thanks team

Answer 13

@jdoe0001 thanks for the video

Answer 14

yw

Answer 15

you had everything right but had to subtract the 18 not add :)

Answer 16

@ninab731 how do you get -18 in your first response

Answer 17

well more so why is it negative when i have 2*9

Answer 18

if i add inside the parenthesis i subtract? and when i subtract inside the parenthesis i add to the right?

Answer 19

take 1/2 of the coefficient of x and square it. multiply by the outside factor 2, then add and subtract 2(-6/2)^2 =18 so u subtract the 18
yes!!

Answer 20

SWEET! i got it thanks