document.write( "Question 1070034: What's the common ratio of -5, 20, -80 i tried this An=A1*(r)^n-1\r
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Algebra.Com's Answer #685175 by MathTherapy(10552)\"\" \"About 
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\n" ); document.write( "What's the common ratio of -5, 20, -80 i tried this An=A1*(r)^n-1
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You can use this formula: \"a%5Bn%5D+=+a%5B1%5Dr%5E%28n+-+1%29\".
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document.write( "However, it's much easier to use the formula that states that: , which results in: \"20%2F%28-+5%29+=+%28-+80%29%2F20%29\" =====> - 4 = - 4
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document.write( "Thus, the common ratio or \"highlight_green%28matrix%281%2C3%2C+r%2C+%22=%22%2C+-+4%29%29\" \n" );
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