The Quadratic Formula

## Quadratic Formula

The solutions of the quadratic equation ax^2 + bx + c = 0 where a not= 0 are given by

You can use this formula for any quadratic equation

But be careful, not all quadratic equations have a solution

## Checklist

Equation is in the form ax^2 + bx + c = 0

Write down your values of a.b and c before you substitute

Use brackets when you are substituting negative numbers

Show what you have substituted in the formula

Simplify what is under the square root and write this down

The +- symbol means you need to do two calculations

## Working it out

You are asked to find solutions

This tells you that you are solving a quadratic equation

You must give your answer correct to the certain amount

Write down at least 5 figures after the decimal point on the calculator display before giving your final answer

You might need to use the S-D button on your calculator to get the answer as a decimal

# The Quadratic Formula

## Quadratic Formula

The solutions of the quadratic equation ax^2 + bx + c = 0 where a not= 0 are given by

You can use this formula for any quadratic equation

But be careful, not all quadratic equations have a solution

## Checklist

Equation is in the form ax^2 + bx + c = 0

Write down your values of a.b and c before you substitute

Use brackets when you are substituting negative numbers

Show what you have substituted in the formula

Simplify what is under the square root and write this down

The +- symbol means you need to do two calculations

## Working it out

You are asked to find solutions

This tells you that you are solving a quadratic equation

You must give your answer correct to the certain amount

Write down at least 5 figures after the decimal point on the calculator display before giving your final answer

You might need to use the S-D button on your calculator to get the answer as a decimal