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Matematika 10.–12. ročník

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Náhled otázek

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1

A quadratic function has the form f(x) = ax² + bx + c. Which condition guarantees that its graph opens downward?

A b < 0
B a > 0
C a < 0
D c < 0
2

The discriminant of a quadratic equation ax² + bx + c = 0 is b² − 4ac. If the discriminant equals zero, what can be concluded about the equation's solutions?

A There is exactly one real solution (a repeated root)
B The solutions are always non-real complex numbers
C There are two distinct real solutions
D There are no real solutions
3

A line passes through the points (2, 5) and (6, 13). What is the slope of this line?

A 8
B 4
C 1/2
D 2
4

Which of the following expressions is a perfect square trinomial?

A x² + 6x + 12
B x² + 6x + 9
C x² + 4x + 8
D x² + 5x + 9
5

The system of equations y = 2x + 1 and y = 2x − 3 is graphed. What is the geometric interpretation of this system?

A The lines are perpendicular and intersect at the origin
B The lines coincide, so there are infinitely many solutions
C The lines intersect at exactly one point
D The lines are parallel and distinct, so there is no solution

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