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OpenStudy (anonymous):
In triangle TRI,
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OpenStudy (nikato):
Sorry was AFK. Since its has a right angle, you can use the pythagoreom theorem. TI is the hypotenuse TR and RI are the legs so (TR)^2 + (RI)^2 = (TI)^2 Substitute (x+1)^2 + (3x)^2 = (3x+1)^2 Next do some foiling and simplifying to find x
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