Multiple choice

Find the zeros of the quadratic polynomial $5x^2 - 4 - 8x$

  1. $3$ and $\dfrac {-2}{5}$
  2. $7$ and $\dfrac {-2}{5}$
  3. $2$ and $\dfrac {-2}{5}$
  4. $5$ and $\dfrac {-2}{5}$
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C Correct answer
Explanation

Polynomial is 5x^2 - 8x - 4. Roots are found by (5x+2)(x-2) = 0. Roots are 2 and -2/5.

AI explanation

Rearrange the polynomial into standard form to get 5x^2 - 8x - 4 = 0. We find the zeros by factoring it into (5x + 2)(x - 2) = 0. Setting each factor to zero results in x = -2/5 and x = 2, so the zeros are 2 and -2/5.

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