Jawabanmu

2013-12-06T18:35:38+07:00
(4y - 5)(y + 3) = (2y + 5)^2
4y^2 + 12 y - 5y - 15 = 4y^2 + 20y + 25
4y^2 - 4y^2 + 12y - 20y - 15 - 25 = 0
-8y - 40 = 0
-8y = 40
-y = 5
y = -5
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