Steps to solving a word problem

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Presentation transcript:

Steps to solving a word problem Identify the ‘unknown’ – Let it be represented by a letter (x, y, a etc…) Form the quadratic equation using the given information Solve the equation Check if your solutions satisfy the problem.

Example 1 The length and width of a rectangle are (3x + 1) and (2x – 1) cm respectively. If the area of the rectangle is 144 cm2, find x. Identify the unknown! Form the equation! Solve! (rej) Are both answers acceptable?

Example 2 The sum of the squares of 2 consecutive positive even numbers is 580. Find the numbers . Identify the unknown: Let one number be x, therefore 2nd number is x + 2 Form the equation Solve! (rej) Are both answers acceptable? :The numbers are 16 and 18 Ans

Example 3 The perimeter of a rectangle is 44 cm. The area of the rectangle is 117 cm2. Find the length of the shorter side of the rectangle. Let one side be x, therefore other side is (44 − 2x) ÷ 2 = 22 – x x Are both answers acceptable? : The shorter side is 9 cm Ans

Example 4 A rectangular swimming pool measures 25 m by 6 m. It is surrounded by a path of uniform width. If the area of the path is 102 m2, find the width of the path. Let the width be x. Therefore, length of path = 25 + 2x, breadth of path = 6 + 2x Area of pool = 25 x 6 = 150 m2 25 m 6 m 25 + 2x 6 + 2x Ans: The width of the path is 1.5 m