A coefficient is the number before the variable (e.g. the 3 in 3x, or the 22 in 22x^2). For example, in the following quadratic equation, the coefficient to x is 4, and the coefficient to y is 12.
4x^2+12y+4
Remember that a number preceded by a ^ is a power, i.e 4x^2 is 4x squared.
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Quadratic equation
Real but not a root of an algebraic equation with rational roots coefficients
Write an algorithm to find the root of quadratic equation
It is used to solve quadratic equations that cannot be factored. Usually you would factor a quadratic equation, identify the critical values and solve, but when you cannot factor you utilize the quadratic equation.
Simply learn and use the quadratic equation formula.