Jawabanmu

2014-03-28T17:37:00+07:00
9R + 90 =  R^{2}
 \sqrt{9R + 90} = R
 3 \sqrt{R}  + 3 \sqrt{10} = R


jadi :
R = 3 \sqrt{R} + 3 \sqrt{10}
jwbnya harus nilai R final, nilai R yg angka.. .______.
Jawaban paling cerdas!
2014-03-28T17:49:41+07:00
9R+90=R^2
-R^2+9R+90=0
R^2-9R-90=0
(R-15) (R+6)
 R=15   R= -6
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