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What value must b have in the function f(x)=x^4+bx^2+1 so that the function has at least one inflection point over the interval [1,2]?

What value must b have in the function f(x)=x^4+bx^2+1 so that the function has at-example-1
User EHayik
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Refer to the image attached.
What value must b have in the function f(x)=x^4+bx^2+1 so that the function has at-example-1
User Gustin
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