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?

The Quadratic Formula

Which statement about the −b-b formula is true?

It works for all quadratic equations

What is the general form of a quadratic equation?

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

What is the quadratic formula?

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

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

22

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

−8-8

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

66

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

To prevent mistakes with minus signs

What should you calculate first when using the quadratic formula?

What's inside the square root

What expression is inside the square root in the quadratic formula?

b2−4acb^2 - 4ac

How many solutions do quadratic equations typically have?

Two

Why do quadratic equations usually have two solutions?

Because of the ±\pm in the formula

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