Book Maths Puzzle Algebra

What is the answer to the simility/vertex of 3x^3+8x-5+4x?

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Book Other Question

What is the definition for the "root of the equation" when doing algebra?
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THE ZERO OF THE QUADRATIC FUNCTION, THAT IS, VALUES OF X WHICH F(X)=0, ARE THE ROOTS OF THE EQUATION. here is my problem:
$500,000 to invest in options in the june call option with the exercise price of $ 125. six- month annualized t-bill rate is 9.59% and the variance is 0.68890