Quadratic basics
- 100
In ax²+bx+c=0, what restriction on a makes the equation quadratic?
- 200
In 3x²−7x+2=0, what number is b?
- 300
Move all terms of…
In the game - 400
Expand x(x−4)=12. What is…
In the game - 500
For which k does…
In the game
Grade 8 · Algebra
Algebra quiz for grade 8: Quadratic equations
This quiz helps revise “Quadratic equations” in Algebra for grade 8. It has 25 questions in five categories: Quadratic basics, Incomplete forms, Discriminant, Vieta's theorem, Quadratic models. Questions get harder as the points go up, from 100 to 500.
A peek at the questions
The 100- and 200-point questions are open here. The rest show only their first words, and there are no answers: all of that is in the game itself.
Incomplete forms
- 100
Solve x²−25=0.
- 200
Solve 3x²−12x=0 by factoring out x.
- 300
How many real…
In the game - 400In the game
- 500In the game
Discriminant
- 100
If D=49, how many real roots does a quadratic equation have?
- 200
Calculate D for x²−6x+5=0.
- 300
Calculate D…
In the game - 400
How many real…
In the game - 500
For which m does…
In the game
Vieta's theorem
- 100
Without solving x²−9x+14=0, find x₁+x₂.
- 200
For 2x²+7x−4=0, find x₁x₂ without calculating the roots.
- 300
Form a monic quadratic…
In the game - 400
One solution of x²−7x+10=0…
In the game - 500
One solution of x²−8x+k=0…
In the game
Quadratic models
- 100
A square tile has area 64 cm². How many centimeters long is one side?
- 200
A rectangle has width x cm, length x+5 cm, and area 84 cm². Find positive x.
- 300
The product of two…
In the game - 400
A right triangle's legs…
In the game - 500
A rectangle has width…
In the game
Play this quiz
All 25 questions and the answers are in the game. Invite your class or friends with a link — guests need no account.
How it works
- Pick a quiz and press “Play”.
- Send students or friends the link — they join from a phone or a computer.
- Choose questions on the board, buzz in first and collect points.