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Exam (elaborations)
Precalculus UPDATED Exam Questions and CORRECT Answers
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Rational Number -any number that is a real number that can be written ass a terminating or repeating decimal Irrational Number -real number that cannot be written as a terminating or repeating decimal (square root of 5) Quadratic Formula -b±[√b²-4ac]/2a Factoring Cubes a^3+b^3=(a+b) (a^2-ab+b^2) -if it is A^3-B^3 then change to (a-b)(a^2+ab+b^2) Discriminant -for quadratic expression, the discriminant is b^2-4ac -determines tht nature of the roots when the quadratic equation=0 -if discriminant is greater than 0, 2 real roots -if discriminant=0, 1 real root -if discriminant is less than 0, 2 imaginary roots
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