Transcription of 21. Quadratic Functions (SC)
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21. Quadratic Functions (SC)
21. Quadratic Functions DEFINING Quadratic Functions In our study of linear Functions , we may recall that a linear function has the general form = + , where x and y are variables and m and c are constants. A graph of a linear function is always a straight line with gradient m and whose intercept on the y-axis is c. Another property of the linear function is that the power of the unknown is one. If we were to draw the graph of y versus x for the linear function, = + , the straight line will cut the x- axis at one point only.
SOLVING QUADRATIC EQUATIONS Quadratic equations take the form .$/ +0$+ & = 0 where a, b and c are real numbers, a ≠ 0. When we solved a linear equation in x, we will have found the value of x that satisfied the equation. To solve the linear equation, we simply use the laws of basic algebra to isolate the unknown, for example, if 2$ − 1 = 7
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