2. The area of a rectangular surface of a match box is (15x^ 2 +12x): square unit. If oneof its sides has length 3x unit;(a) find the length of another side.(b) x = 5 cm , find the actual area, length and breadth of that surface.
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area = 15x²+12x
one side = 3x
another side = 15x²+12x/3x = 5x+4
length = 3×5 = 15 cm
breadth = 15+4 = 19 cm
actual are = 15×19
=285cm²
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