Question

f(x)=-x^2+2x+5 Having trouble finding the x-intercept.

Answer 1

to find the x-intercepts solve the equation
\[ \large -x^2+2x+5=0 \]

Answer 2

Can I get rid of that negative sign?

Answer 3

well the problem is that the quadratic can't be factorised.

You'll need the general quadratic formula or to complete the square for the x- intercepts

Answer 4

I was using complete the square but the negative sign in front of the x^2 confused me

Answer 5

then multiply by (-1) the equation

Answer 6

rewrite the equation

x^2 - 2x = 5

now complete the square

Answer 7

Ok thanks will try again with this knowledge

Answer 8

hope it helps