GRE Math Formulas Guaranteed Success

GRE Math Formulas Guaranteed Success slope intercept formula ️y = mx + b m = slope b = y-intercept (a^x)(a^y)=? ️a^(x+y) (a^x)/(a^y)=? ️a^(x-y) two point slope formula ️(Δy)/(Δx) PEMDAS ️Parentheses, exponents, multiplication and devision (L to R), addition and subtraction (L to R) √1 ️1 √2 ️1.4 √3 ️1.7 √4 ️2 negative × negative = ? ️positive positive × negative = ? ️negative Only even prime number ️2 x⁻ⁿ = ? ️1/xⁿ A number is divisible by 3 if... ️The sum of its digits is divisible by 3 A number is divisible by 5 if... ️It ends in 0 or 5 A number is divisible by 2 if... ️Its ones place is divisible by 2 Area of a Δ ️½bh Pythagorean Theorem ️(Only applies to right triangles) c² = a² + b² where a and b are the sides and c is the hypotenuse Area of a O ️πr² Circumference of a O ️2πr or πd Distance between two points ️d = √(x₁-x₂)² + (y₁-y₂)² Volume of rectangular solid ️lwh Volume of circular cylinder ️πr²h Calculating an Average ️(total value, or sum)/(# of numbers being averaged) Calculating Percent Change ️(difference/original) × 100 Quadratic Equations ️x²-y² = (x+y)(x-y) (x+y)² = x² + 2xy + y² (x-y)² = x² - 2xy - y² Solving an Inequality ️When multiplying or dividing both sides by a negative number, always change the inequality sign (i.e. if it was then change it to , if it was then change it to ) Calculating Probability ️(# favorable outcomes)/(total # possible outcomes)