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
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)
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?