# Math Help - Solve this quadratic equation

1. ## Solve this quadratic equation

1. Solve the quadratic equation x^2 -2x -1 = 0

2. If f(x) = 3x^2 -2x + 4 nd f(x + h) -f(x)

Thanks!

2. Originally Posted by fyremelody
1. Solve the quadratic equation x^2 -2x -1 = 0

2. If f(x) = 3x^2 -2x + 4 nd f(x + h) -f(x)

Thanks!
Don't use all those tags, it's impossible to see what you've done

$x = \frac{-b\pm \sqrt{b^2-4ac}}{2a}$

Doesn't seem to be much of a problem, both these questions can be solved using the quadratic formula.

For the second part of Q2: $f(x+h) = [3(x+h)^2 - 2(x+h) + 4] - 3x^2-2x+4$

Tidy up the algebra and find x in terms of h using the quadratic formula.