Find the x & y intercepts
f(x)=x²-9x+7
please help me

Question

anonymous · Answer

$$f(0)=0^2-9\times0+7=7$$ which is the y intercept.$$f(x)=0=x^2-9x+7=>x=(9\pm \sqrt{53})/2$$Which are the x intercepts.

anonymous · Answer

the answer is x-intercept is (8.1,0.9)
y-intercept is (0,7)
how did they get these answers

anonymous · Answer

The x intercepts occur when y=0 (or, if you like, f(x)=0) so you just put this into you equation (remember, this is a quadratic function this will have two solutions and the function will therefore have two x intercepts). Similarly, the y intercept occurs when x=0, so you put this into your equation.

anonymous · Answer

?

anonymous · Answer

i know how to do y-intercepts but not x

anonymous · Answer

X intercepts occur when f(x)=0, so make your equation equal to zero and solve.

anonymous · Answer

plz show me how

anonymous · Answer

Do you know how to solve a quadratic equation?

anonymous · Answer

no

anonymous · Answer

http://www.purplemath.com/modules/quadform.htm

anonymous · Answer

i just found  a great website that did it for me ty

anonymous · Answer

Good :)