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Question

Determine whether the graph of each function is symmetric with respect to the origin. f(x)=7x5+8xf(x)=-7 x^{5}+8 x

Solution

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Answered 2 years ago
Answered 2 years ago
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To check for origin symmetry\textbf{origin symmetry}, we need to replace xx with x-x and f(x)f(x) with f(x)-f(x). If we get an equal expression, the function is symmetrical\textbf{symmetrical} in regards to the origin\textbf{origin}.

f(x)=7x5+8xf(x)=7(x)58xf(x)=7x58xf(x)=7x5+8x\begin{align*} f(x)&=-7x^5 + 8x \to -f(x)=-7\left(-x\right)^5 -8x \to -f(x)&=7x^5-8x\\ f(x)&=-7x^5+8x \end{align*}

Since we got a valid expression, f(x)f(x) is symmetrical in regards to the origin\textbf{symmetrical in regards to the origin}.

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