Question

The value -2 is a lower bound for the zeros of the function shown below.

f(x)=4x^3-12x^2-x+15
A)true
B)false

Answer 1

a) true

Explanation:

The bottom-line numbers from synthetic division alternate signs, indicating that -2 is a lower bound. The given statement is true.

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If the signs were all positive, it would indicate the proposed zero is an upper bound.

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A graph shows all real zeros are greater than -2.