# Math Help - fractional confusion

1. ## fractional confusion

2/3 - 15(-1/2)^2 + (-1/2)^-2

= 2/3 - 7.5 + 1?

2. Originally Posted by x-disturbed-x
2/3 - 15(-1/2)^2 + (-1/2)^-2

= 2/3 - 7.5 + 1?
$(-1/2)^2\ =\ (-1/2).(-1/2)\ =\ 1/4$

$(-1/2)^{-2}\ =\ (-2).(-2)\ =\ 4$

so now you should be able to complete this yourself.

RonL

3. ## tangents n norms

The equation of a curve is y = 3x^2 - 2x + 1

find the coordinates of the point R on the curve at which the gradient is -14.