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Solving Quadratic Equations Using the Quadratic Formula

Example

Solve using the quadratic formula: 36x2 + 16 + 48x = 0

Solution

Step 1 Write the quadratic equation in standard form, ax2 + bx + c = 0. 36x2 + 16 + 48x = 0
On the left side, write the terms in decreasing powers of x.

Each term is divisible by 4. To simplify the calculations, divide both sides of the equation by 4.

Step 2 Identify the values of a, b, and c.

36x2 + 16 + 48x = 0

 

Step 3 Substitute the values of a, b, and c into the quadratic formula.
Step 4 Simplify.
Step 5 Check each solution.

We leave the check to you.

 

We say that is a solution of multiplicity two.

 

Example 2

Solve using the quadratic formula: x2 + 5 = 3x

Step 1 Write the quadratic equation in standard form, ax2 + bx + c = 0. x2 + 5 = 3x
Subtract 3x from both sides of the equation.

Step 2 Identify the values of a, b, and c.

Step 3 Substitute the values of a, b, and c into the quadratic formula.
Step 4 Simplify.
Notice the negative number under the square root symbol.

The radical does not represent a real number.

Therefore, the equation x2 + 5 = 3x has no real number solutions.

 
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