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What is the positive root of the equation x 2 - 2x = 120
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What is the positive root of the equation x 2 - 2x = 120

User Scotru
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2 Answers

6 votes
x²-2x=120
x²-2x-120=0
(x+10)(x-12)=120
x=-10, 12
User Ventus
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7.9k points
5 votes
There is a shortcut.

It can be converted to (x-1)^2 = 121

If you know 121 = 11^2

Then you get x-1 = 11 or -11, so x = 12 or -10
User Arman Ebrahimpour
by
9.0k points
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