SAT Math formulas

How to complete the square?

(b/2)²

What is the equation of a circle?

(x-h)²+(y-k)²=r²

How to find the roots of a quadratic?

-b +- square root of b² +4ac ALL divided by 2a

rewrite x²-2xy+y²

(x-y)²

rewrite x²+2xy+y²

(x+y)²

rewrite x²-y²

(x+y)(x-y)

how do you solve for the product of the roots?

c/a

how do you solve for the sum of the roots? (aka solutions to the equation)

-b/a

How to find density?

mass/volume