Trigonometry Examples

Solve for x r(r+7)-78=0
Step 1
Simplify each term.
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Step 1.1
Apply the distributive property.
Step 1.2
Multiply by .
Step 1.3
Move to the left of .
Step 2
Factor using the AC method.
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Step 2.1
Consider the form . Find a pair of integers whose product is and whose sum is . In this case, whose product is and whose sum is .
Step 2.2
Write the factored form using these integers.
Step 3
If any individual factor on the left side of the equation is equal to , the entire expression will be equal to .
Step 4
Set equal to and solve for .
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Step 4.1
Set equal to .
Step 4.2
Add to both sides of the equation.
Step 5
Set equal to and solve for .
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Step 5.1
Set equal to .
Step 5.2
Subtract from both sides of the equation.
Step 6
The final solution is all the values that make true.