01.20.2017. Friday
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 Algebra Polynomials⦿ Special Binomials Progressions⦿ Arithmetic progression⦿  Geometric progression Logarithm⦿ Logarithm⦿ Changing the base of a logarithm Exponents⦿ Powers Roots⦿ Roots Equations⦿ Quadratic equation Complex numbers⦿ Roots of complex numbers

Equations

$a{x}^{2}+bx+c=0$

${x}_{1,2}=\frac{-b±\sqrt{{b}^{2}-4ac}}{2a}$

Factors of a a quadratic equation:

$a{x}^{2}+bx+c=a\left(x-{x}_{1}\right)\left(x-{x}_{2}\right)$

Vieta's formulas:

Discriminant:

$D={b}^{2}-4ac$
 two different real solutions one real solution no real solution (two complex conjugate solutions)

$y=a{x}^{2}+bx+c$
$P\left(-\frac{b}{2a},-\frac{{b}^{2}-4ac}{a}\right)$