Exercise 2 | Wiskunde op Tilburg University

Determine all zeros of the function

$f(x)=5x^2-7x+3$ .

Antwoord 1 correct

Correct

Antwoord 2 optie

$x_1=\frac{7}{10}+\frac{1}{10}\sqrt{11}$ and

$x_2=\frac{7}{10}-\frac{1}{10}\sqrt{11}$

Antwoord 2 correct

Fout

Antwoord 3 optie

$x_1=\frac{7}{10}+\frac{1}{10}\sqrt{109}$ and

$x_2=\frac{7}{10}-\frac{1}{10}\sqrt{109}$

Antwoord 3 correct

Fout

Antwoord 4 optie

$x_1=-\frac{7}{10}+\frac{1}{10}\sqrt{11}$ and

$x_2=-\frac{7}{10}-\frac{1}{10}\sqrt{11}$

Antwoord 4 correct

Fout

Antwoord 1 optie

This function has no zeros.

Antwoord 1 feedback

Correct:

$D=(-7)^2-4\cdot 5 \cdot 3=-11$ . According to the discriminant criterion (See Extra explanation: zeros) this function has no zeros.

Go on.

Antwoord 2 feedback

Wrong:

$D=(-7)^2-4\cdot 5 \cdot 3=-11$ .

See Extra explanation: zeros.

Antwoord 3 feedback

Wrong:

$D=(-7)^2-4\cdot 5 \cdot 3=-11$ .

See Extra explanation: zeros.

Antwoord 4 feedback

Wrong:

$D=(-7)^2-4\cdot 5 \cdot 3=-11$ .

See Extra explanation: zeros.