ACT Math: What Formulas Should I Memorize?

Hey guys, I'm preparing for the ACT and I'm wondering what are the most important math formulas I should memorize to do well on the test? What did you find helpful when you took the test? Thanks in advance!

Hey! It's great that you're trying to prepare for the ACT Math section. Memorizing key formulas can be super helpful, as the ACT doesn't provide you with a formula sheet. Here's a list of essential formulas you should know:

1. Distance formula: d = √((x2 - x1)^2 + (y2 - y1)^2)

2. Slope-intercept form: y = mx + b

3. Pythagorean theorem: a^2 + b^2 = c^2

4. Area of a triangle: A = (1/2)bh

5. Volume of a cylinder: V = πr^2h

6. Quadratic formula: x = (-b ± √(b^2 - 4ac))/(2a)

7. Midpoint formula: M(x, y) = ((x1 + x2)/2, (y1 + y2)/2)

8. Point-slope form: y - y1 = m(x - x1)

9. Area of a circle: A = πr^2

10. Circumference of a circle: C = 2πr

11. Exponent rules:

a. (a^m)(a^n) = a^(m + n)

b. (a^m)/(a^n) = a^(m - n)

c. (a^m)^n = a^(mn)

It's important to note that knowing these formulas is just the start. Make sure to practice applying them in various contexts so you can comfortably use them during the test. Working through practice problems will help you solidify these formulas in your memory and improve your confidence in applying them.

Good luck with your ACT prep!