Precalculus

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Find the bounds on the real zeros of the following function. Please show all of your work.f(x)=x^4+2x^3-x^2-1

• Precalculus -

Make a rough sketch.
A few button-pushes on your calculator will show that there is a zero near -2.5 and another between 1/2 and 1
for x's > 1 and x < -2/5 the function just "blows up"
looks like 2 reals and 2 complex roots

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