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Determine the values of k for which the function f(x) = 4x^2-3x + 2kx + 1 has two zeros. Check these values in the original equation. ​

Sagot :

xero099

k must be greater than or equal to 22.75 to have two different zeros.

How to determine the value of missing coefficient in second order polynomials

Second order polynomials are algebraic expressions that observe the following form:

[tex]p(x) = a\cdot x^2 + b\cdot x + c[/tex]   (1)

Where:

  • a, b, c - Coefficients
  • x - Independent variable

For polynomials of the form p(x) = 0, we can infer the nature of their roots by applying the following discriminant:

d = b² - 4 · a · c   (2)

According to (2), there are three cases:

  1. If d < 0, then there are two conjugated complex roots.
  2. If d = 0, then the two roots are the same real number.
  3. If d > 0, then the two roots are two distinct real numbers.

Now we have the following discriminant case:

-(3 + 2 · k)² - 4 · (1) · (4) ≠ 0

-(9 + 6 · k + 4 · k²) - 16 ≠ 0

-9 - 6 · k - 4 · k² - 16 ≠ 0

4 · k²+ 6 · k +25 ≠ 0

This characteristic polynomial has two conjugated complex roots, then we conclude that all values of k must positive or negative, but never zero. By graphng tools we find that k must be greater than or equal to 22.75 to have two different zeros.

To learn more on polynomials, we kindly invite to check this verified question: https://brainly.com/question/11536910

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