SOLUTION: I need help!!! My problem is I must solve this equation by completing the square!!! The equation is r2-2r-35=0!!! Can you please help me!!!

SOLUTION: I need help!!! My problem is I must solve this equation by completing the square!!! The equation is r2-2r-35=0!!! Can you please help me!!!

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Question 142537: I need help!!! My problem is I must solve this equation by completing the square!!! The equation is r2-2r-35=0!!! Can you please help me!!!
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Start with the given equation

Add to both sides

Take half of the "r" coefficient to get (ie ).

Now square to get (ie )

Now add this value to both sides

Combine like terms

Now factor to get

Take the square root of both sides

or

Simplify

or

Add to both sides for each case

or

So our answers are

or

Notice if we graph we can see that the roots are

or

. So this verifies our answer.

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