Originally Posted by
erinwithane Hello Everybody
Im not in high School, but I am studying for my GMAT and need some help with some stuff that I havnt done in years.
First
What are the formulas for finding the intercepts of a quadratic equation.
I think negetive b plus minus the square root of 4ac divided by 2a is this correct? which intercept does this give you? Whats the formula for finding the other intercept?
How do you solve a problem where you are given the intercepts and asked to choose which equation?
For example:
What equation has te intercepts of (-1,-5) Mr F says: If you mean the equation of a graph that passes through the point (-1, -5) then there are an infinite number of possible answers. eg. any line of the form y + 1 = m(x + 5) where m is the (non-zero) gradient of the line.
No graphing calculators allowed or else this would be easy.