IXL - Solve a quadratic equation using the quadratic formula (Precalculus practice)

Solve the quadratic equation.

–

Write one exact, simplified solution in each box. You can add or remove boxes. If a solution is not a real number, write it in the form

–

where

and

are real numbers.

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Learn with an example

question

Solve the quadratic equation.

–

Write one exact, simplified solution in each box. You can add or remove boxes. If a solution is not a real number, write it in the form

–

where

and

are real numbers.

key idea

You can use the quadratic formula to solve a quadratic equation of the form

–

solution

You were asked to solve the quadratic equation

–

Use the quadratic formula with

–

and

–

(

–

)

(

–

)

–

(

–

)

(

)

(

–

)

108

–

112

–

Simplify the square root

–

Simplify the square root

So, the solutions are

–

and

–

Simplifying,

–

and

–

Looking for more? Try these:

Lesson: The quadratic formula

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Teacher tools

Work it out

Not feeling ready yet? These can help:

B.2Evaluate variable expressions involving integers

EE.1Simplify radical expressions

K.1Introduction to complex numbers

Lesson: The quadratic formula

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