## Math Formulas to Ace the ACT

The SAT provides a list of formulas you will need to complete its math section. The makers of the ACT are not so generous. You will need to have a host of formulas committed to memory for the ACT's math section. Here are a few to get you started.

### Pythagorean Theorem

For any right triangle, the length of the hypotenuse (

*c*) squared is equal to the sum of the squares of the two shorter sides (

*a* and

*b*).

### Logarithms

You should understand logarithms and how to rewrite them.

asks

*b* to what power (

*y*) will result in

*x*. You can rewrite it as:

.
When

*x* is a product of two different numbers, it may be easier to solve if you remember the following formula:

### Quadratic Formula

Solve any quadratic equation in the form ax^2+bx+c=0 with this formula. For those formulas that are difficult to find the difference of squares, or if you are in a rush on an exam, the quadratic formula will be very nice to know.

### Slope-Intercept Formula

In this formula,

*m* is the slope and

*b *is the y-intercept. If you get an equation that is not in this format, you will want to re-write it so that it is. It makes graphing a line much easier.

### Percentages

To find

*x* percent of a number (

*n*),

To find what percent a number (

*n*) is of another number (

*m*),

And finally,

*n* is

*x* percentage of what number?

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