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Me tumhe pareshan nahi kar raha!!!! me sacchai bata raha hu!!!! hehehehe!!! tumhari sis tumhe kya chidati he???? mujhe bhi batao na |
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Answer» tion:✬ Length = 18 cm ✬✬ Breadth = 15 cm ✬Step-by-step explanation:Given:Length of RECTANGLE is greater than breadth by 3 cm.Area remains same , after increasing & decreasing length and breadth by 9 and 5 cm respectively.To Find:DIMENSIONS of rectangle ?Solution: LET the breadth of rectangle be x cm. Therefore,➼ Length will be = 3 more than x➼ Length = (x + 3) cmAs we KNOW that★ Ar. of Rectangle = Length × Breadth ★\implies{\rm }⟹ (x + 3) × x\implies{\rm }⟹ x² + 3xSo the area is x² + 3xNow , A/qNew length = x + 3 + 9 = (x + 12) cmNew breadth = (x – 5) cmNew area = Old area➟ New (Length × Breadth) = x² + 3x➟ (x + 12) (x – 5) = x² + 3x➟ x(x – 5) + 12(x – 5) = x² + 3x➟ x² – 5x + 12x – 60 = x² + 3x➟ 7x – 3x = 60➟ 4X = 60➟ x = 60/4 = 15 cmSo,Breadth is x = 15 cmLength is (x + 3) = 15 + 3 = 18 cm |
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