Solving Quadratic Equations using the '-b Formula' (Junior Cert Mathematics): Quizzes

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Solving Quadratic Equations using the '-b Formula'
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What is the −b-b formula also known as?

Quadratic Formula

For which quadratic equations does the −b-b formula work?

All quadratic equations

What is the general form of a quadratic equation?

ax2+bx+c=0ax^2 + bx + c = 0

In ax2+bx+c=0ax^2 + bx + c = 0, what does aa represent?

Number in front of x2x^2

In ax2+bx+c=0ax^2 + bx + c = 0, what does bb represent?

Number in front of xx

In ax2+bx+c=0ax^2 + bx + c = 0, what does cc represent?

The constant term

What is the quadratic formula?

x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

Why should you use brackets when substituting values into the formula?

To prevent mistakes with signs

How many solutions do quadratic equations typically have?

Two solutions

In 2x2−8x+6=02x^2 - 8x + 6 = 0, what is the value of aa?

22

In the example, what does 16\sqrt{16} equal?

44

What are the solutions to 2x2−8x+6=02x^2 - 8x + 6 = 0?

x=3x = 3 or x=1x = 1

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