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Topics
Pre-Algebra
Mean
Mode
Greatest Common Factor
Least Common Multiple
Order of Operations
Fractions
Mixed Fractions
Prime Factorization
Exponents
Radicals
Algebra
Combine Like Terms
Solve for a Variable
Factor
Expand
Evaluate Fractions
Linear Equations
Quadratic Equations
Inequalities
Systems of Equations
Matrices
Trigonometry
Simplify
Evaluate
Graphs
Solve Equations
Calculus
Derivatives
Integrals
Limits
Algebra Calculator
Trigonometry Calculator
Calculus Calculator
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Square Root
In mathematics, a square root of a number x is a number y such that y² = x; in other words, a number y whose square (the result of multiplying the number by itself, or y ⋅ y) is x. For example, 4 and −4 are square roots of 16, because 4² = (−4)² = 16. Every nonnegative real number x has a unique nonnegative square root, called the principal square root, which is denoted by √(x), where the symbol √() is called the radical sign or radix.
Quadratic Formula
In elementary algebra, the quadratic formula is a formula that provides the solution(s) to a quadratic equation. There are other ways of solving a quadratic equation instead of using the quadratic formula, such as factoring (direct factoring, grouping, AC method), completing the square, graphing and others. Given a general quadratic equation of the form ax²+bx+c=0 with x representing an unknown, a, b and c representing constants with a ≠ 0, the quadratic formula is: where the plus-minus symbol "±" indicates that the quadratic equation has two solutions.
Quadratic Equation
In algebra, a quadratic equation (from the Latin quadratus for "square") is any equation that can be rearranged in standard form as ax²+bx+c=0 where x represents an unknown, and a, b, and c represent known numbers, where a ≠ 0. If a = 0, then the equation is linear, not quadratic, as there is no ax² term. The numbers a, b, and c are the coefficients of the equation and may be distinguished by calling them, respectively, the quadratic coefficient, the linear coefficient and the constant or free term.
方程組
方程組（英語：system of equations）又稱聯立方程（simultaneous equations），是兩個或兩個以上含有多個未知數的方程聯立得到的集。未知數的值稱為方程組的根，求方程組根的過程稱為解方程組。一般在方程式的左邊加大括號標注。 解方程組的方法大致上有畫圖法、代入法、消元法（包括高斯消元法）、矩陣法（包括克萊姆法則）等。
Cube Root
Real Number
Mean, median, & mode example
Khan Academy
Solving Square Root / Cube Root Equations Pre-Algebra / Algebra 1
YouTube
Quadratics the Fundamental Theorem of Algebra
Khan Academy
Solving quadratic equations by factoring (old)
Khan Academy
Method of Substitution Steps to Solve Simultaneous Equations
YouTube
Statistics intro: Mean, median, mode
Khan Academy
(x+9)(x-9)
$(x+9)(x−9)$
x^2-7x+12
$x_{2}−7x+12$
6(x+2)
$6(x+2)$
x^2-4x-12
$x_{2}−4x−12$
7x(2x-4)
$7x(2x−4)$
x^2+11x+24
$x_{2}+11x+24$
3(x-3)(4x-4)
$3(x−3)(4x−4)$
x^2-6x-160
$x_{2}−6x−160$
2x{(x-6)}^{2}
$2x(x−6)_{2}$
3x^2-10x+8
$3x_{2}−10x+8$
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