[SOLVED]Quadratic Function + linear function

Write the following into the form of

and find the vertex, the symmetric axis and y-intercept

a)

Vertex = (-1,-2), Symmetric, x=-1, y-intercept, when x=0, y=-1

Am i doing the correct method to calculate ??

b)

Vertex = (2,3), symmetric x=2, y-intercept=-1

c)

Vertex (-1,-6), symmetrix =-1, y-intercept=-6

am i correct ?

Re: Quadratic Function + linear function

Quote:

Originally Posted by

**gilagila**

You can't factorise and then get rid of the other factors, and then say the functions are equal.

For the second, you should be writing

See what you can do for the third.

Re: Quadratic Function + linear function

Quote:

Originally Posted by

**Prove It** You can't factorise and then get rid of the other factors, and then say the functions are equal.

For the second, you should be writing

See what you can do for the third.

oops, just notice that my completing in square is wrong just now, able to correct, get the same answer as you.

how about the no.3, i make some changes, is it correct ?

Re: Quadratic Function + linear function

Quote:

Originally Posted by

**gilagila**

Note the corrections.

Re: Quadratic Function + linear function

Quote:

Originally Posted by

**Quacky** Note the corrections.

oops, never notice for Q3 the k also need x3, ya..finally resolved all the question.

TQ