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OpenStudy (anonymous):
quadratic function (-1,8)(1,6)(2,1)
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OpenStudy (anonymous):
?
OpenStudy (mathstudent55):
y = ax^2 + bx + c You can substitut the values of the three points you have in for x and y. Then you need to solve a system of 3 equations in a, b, and c. Once you get a, b, and c, substitute them in the equation above.
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