SOLUTION: Write a quadratic function f whose zeros are 1 and −9

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Question 1117423: Write a quadratic function f whose zeros are 1 and −9
Answer by ikleyn(52775) About Me  (Show Source):
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The simplest such function is  

    f(x) = (x-1)*(x-(-9)),             (1)


the product of two binomials  (x-1)  and  (x-(-1)), associated with the roots.


Right side (1) can be simplified

    f(x) = (x-1)*(x+9).                (2)