ALEKS Math formulas for problems found on the SAT and ACT. While the SAT lists many of the formulas at the beginning of each math test, the ACT does not. And, you will save time if you memorize these.Quadratic Formula - ANSWER -b±[√b²-4ac]/2a Slope - ANSWER (y₂-y₁)/(x₂-x₁) Slope-Intercept - ANSWER y=mx+b a³-b³ - ANSWER (a-b)(a²+ab+b²) a³+b³ - ANSWER (a+b)(a²-ab+b²) a²-b² - ANSWER (a-b)(a+b) 1 / 2
a²-2ab+b² - ANSWER (a-b)² a²+2ab+b² - ANSWER (a+b)² (a+b)(c+d) - ANSWER ac+ad+bc+bd a(b+c) - ANSWER ab+ac sine ratio - ANSWER opposite ÷ hypotenuse cosine ratio - ANSWER adjacent ÷ hypotenuse tangent ratio - ANSWER opposite ÷ adjacent
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