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the length of a rectangle is 2 x + 3 units and the corresponding breadth is 2 x minus 3 units find the area of the rectangle in terms of X what will be the area of rectangle if x is equal to 30 units |
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Answer» Answer: LENGTH , l = 2x +3 units Breadth, b = 2x - 3 units Area of rectangle = (2x+3)(2x-3) [ using identity (a+b)(a-b)= a^2-b^2 ] Area of rectangle= (2x)^2 - (3)^2 Area of rectangle =4x^2 - 9 So, area of rectangle in terms of x will be 4x^2 -9 square units. When x =30 units Then, Area of rectangle= 4(30)^2 -9 Area of rectangle= 4×900 -9 Area of rectangle = 3591 sq. units |
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