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erastova [34]
2 years ago
11

How many and of which kind of roots does the equation f(x)=x^3+2x^2+4x+8 have?

Mathematics
1 answer:
ss7ja [257]2 years ago
4 0

The <em>cubic</em> equation f(x) = x³ + 2 · x² + 4 · x + 8 has one <em>real</em> root and two <em>complex</em> roots.

<h3>What kind of roots does have a cubic equation? </h3>

In this problem we have a <em>cubic</em> equation and the nature of their roots must be inferred according to a <em>algebraic</em> method.

Cubic equations are polynomials of the form y = a · x³ + b · x² + c · x + d, there is a method to infer the nature of the roots of such polynomials: The discriminant from Cardano's method, an <em>analytical</em> method used to solve polynomials of the form a · x³ + b · x² + c · x + d = 0.

The discriminant is described below:

Δ = 18 · a · b · c · d - 4 · b³ · d + b² · c² - 4 · a · c³ - 27 · a² · d²      (1)

Where:

  1. There are three <em>distinct real</em> roots for Δ > 0.
  2. Real roots with multiplicity greater than 1 for Δ = 0.
  3. A <em>real</em> root and two <em>complex</em> roots for Δ < 0.

If we know that a = 1, b = 2, c = 4 and d = 8, then the nature of the roots is:

Δ = 18 · 1 · 2 · 4 · 8 - 4 · 2³ · 8 + 2² · 4² - 4 · 1 · 4³ - 27 · 1² · 8²

Δ = - 1024

The <em>cubic</em> equation f(x) = x³ + 2 · x² + 4 · x + 8 has one <em>real</em> root and two <em>complex</em> roots.

To learn more on <em>cubic</em> equations: brainly.com/question/13730904

#SPJ1

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Account A and Account B both have a principal of $2,000 and an annual interest rate of 2%. No additional deposits or withdrawals
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Account B earns more interest.

After 20 years, account B will have earned $171.89 more.

Step-by-step explanation:

Let's calculate the total for each account.

Account A:

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A=P(1+rt)

Where A is the future value, P is the principal, r is the rate, and t is the time in years.

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Multiply. So, the total amount of money in Account A after 20 years is:

A=\$2800

Since we initially deposited $2000 and our total is now $2800, this means that we earned an interest of 2800-2000=\$ 800

Account B:

Account B earns compound interest. Like Account A, Account B has a principal value of $2000 and the interest rate is 2% or 0.02. We also know that it's compounded annually, so once per year. We can use the compound interest formula:

B=P(1+\frac{r}{n}})^{nt}

Where B is the future value, P is the principal, r is the rate, n is the times compounded per year, and t is the time in years.

So, let's substitute 2000 for P, 0.02 for r, n for 1 (since it's compounded annually), and t for 20. This yields:

B=2000(1+\frac{0.02}{1})^{(1)(20)}

Simplify this to acquire:

B=2000(1.02)^{20}

Evaluate. Use a calculator. So, after 20 years, the amount of money in Account B is:

B\approx\$2971.89

Since our principal was $2000, this means that we earned an interest of approximately  2971.89-2000=\$ 971.89.

So, Account A earned an interest of $800 and Account B earned an approximate interest of $971.89.

So, Account B earned more interest.

And it earned 971.89-800=\$ 171.89 more than Account A.

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Add '-2y' to each side of the equation.

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