If f(x)=x(x+1) 2 for which value of x, f(-x)=f(3) ? - Vidyadip

Question

If $\mathrm{f}(\mathrm{x})=\frac{x(x+1)}{2}$ for which value of $\mathrm{x}, \mathrm{f}(-\mathrm{x})=\mathrm{f}(3) ?$

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Answer

$x=4$ OR $x=-3$

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