Two or more triangles are similar if they have the same shape. Since the Praxis 5169 is considered a selected-response exam, it is scored by the computer. FOIL\((x+a)(x+b)\)\(=x^2+(b+a)x +ab\) Difference of Squares\(a^2-b^2= (a+b)(a-b)\)\(a^2+2ab+b^2=(a+b)(a+b) \)\(a^2-2ab+b^2=(a-b)(a-b)\) Reverse FOIL\(x^2+(b+a)x+ab=\) \((x+a)(x+b)\), Refers to the number of times a number is multiplied by itself.\(8 = 2 2 2 = 2^3\), It is a way of expressing numbers that are too big or too small to be conveniently written in decimal form.In scientific notation all numbers are written in this form: \(m \times 10^n\)Scientific notation:\(510^0\)\(-2.510^4\)\(510^{-1}\)\(2,12245610^3\), The number we get after multiplying an integer (not a fraction) by itself. A Comprehensive Collection of Free Praxis Math Practice Tests, Top 10 Free Websites for Praxis Core Math Preparation. Consider the line that goes through points \(A(x_{1},y_{1}) \) and \(B(x_{2},y_{2})\). Knowledge bank / By Perfect answer. For example, many test takers will have completed an education program in the field, and therefore, may have related class materials or textbooks that can be useful. \(x^a .x^b=x^{a+b}\)\(\frac{x^a}{x^b} = x^{a-b}\)\(\frac{1}{x^b }= x^{-b}\)\((x^a)^b=x^{a.b}\)\((xy)^a= x^a .y^a\)\(x^0=1\)\(\sqrt{xy}=\sqrt{x} .\sqrt{y}\)\((-1)^n=-1\), if n is odd.\((-1)^n=+1\), if n is even.If \(0