Need help, I'm stuck on this​

The answer is 729/64.

Step-by-step explanation:

I would first simplify the equation.

In the denominator, you can get rid of b^0 because that just equals 1.

For the a's in the numerator and denominator, you have to flip them so the exponents can be positive.

Equation:  

Now, you can subtract a and a^3.  This would be 1/a^2.

Equation:

Now, you can square the whole equation.

Equation:

This is the simplified equation.  Now you can plug in -2 and -3.

Equation:

Equation:

Equation: 729/64

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.