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![\left[\begin{array}{ccc}\Delta=b^2-4.ac\\ \\ x=\frac{-b\±\sqrt{\Delta}}{2.a}\end{array}\right]](/tpl/images/0135/8356/31768.png)
= 32² - 4.16. (- 9) 
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Which is a zero od the quadratic function f(x)=16x²+32x-9?...
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