Originally Posted by

**C.C** y=1/2x^2

given point= (4,8)

I wasn't in my class when they did this but this is what I did.

Line form of point = y=m(x-4)+8

1/2x^2= m(x-4)+8

0=m(x-4)-1/2x^2+8

0=m(x-4)- x^2 +16 ... you forgot to multiply m(x-4) by 2

0=m(x-4) - (x-4) (x+4)

Here's where I get confused.. My friend told me at this point I do grouping or something and yeah... I got this

0=(m + (x+4) (x-4)

0=(m+(4+4)) (x-4)

m=8

then I plug the m into the equation and get y=8(x-4)+8 for the equation. Can anyone check for me if it's right or wrong?