IF your expression "a-2 b-3" is meant to be "(a-2)(b-3)" then Bill is correct, and the answer is -5 when a is 3 and b is -2.
However, if you mean"a - 2b -3" then, substituting the values you gave for a=3 and b=-2, that would be "3 - 2(-2) -3" which is...

The sign (positive or negative) is completely independent of the magnitude of the fraction (or the repeating decimal) -- which means that you can ignore the signs when dividing, then decide whether it is postive or negative by counting how many minus signs there are in front of the numerator and...

An exponent following a value has 3 parts, which mean threee very different things:
1.) The denominator (on "top") is the "POWER" that the value is raised to (2 for squared, 3 for cubed, etc.)
2.) The numerator (or "bottom") is a "ROOT"...

Altho this is an algebra question (with three very good answers given above), I'd like to add a "test-prep" tip, especially for so-called "standardized" tests, such as the SAT:
Once you have factored one polynomial, don't start all over to factor the other one.
Instead,...

Note that the length of the cord (1.2m) and the depth of the pool (3.3m) a both irrelevant.
Of course, this ignores the slight variation in gravity as the ball gets closer to the center of the Earth (but we don't even know how far the pool is above sea level ;^> ), and it assumes...

Since these functions are all second-order polynomials ("quadratics"), their slope is constantly changing at every point.
The only way that a function can have the same slope everywhere is if the function is "linear" and theonly exponent of X is one.
(I like...