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Two Squares Have Sides X Cm and (X + 4) Cm. the Sum of Their Area is 656 Sq. Cm. Express this as an Algebraic Equation in X and Solve the Equation to Find the Sides of the Squares. - ICSE Class 10 - Mathematics

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Question

Two squares have sides x cm and (x + 4) cm. The sum of their area is 656 sq. cm. Express this as an algebraic equation in x and solve the equation to find the sides of the squares.

Solution

Given that, two squares have sides x cm and (x + 4) cm.
Sum of their area = 656 cm2
∴ x2 + (x + 4)2 = 656
x2 + x2 + 16 + 8x = 656
2x2 + 8x – 640 = 0
x2 + 4x – 320 = 0
x2 + 20x – 16x – 320 = 0
x(x + 20) – 16(x + 20) = 0
(x + 20) (x – 16) = 0
x = -20, 16
But, x being side, cannot be negative.
So, x = 16
Thus, the sides of the two squares are 16 cm and 20 cm.

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 Selina Solution for Selina ICSE Concise Mathematics for Class 10 (2018-2019) (2017 to Current)
Chapter 6: Solving (simple) Problems (Based on Quadratic Equations)
Ex.6B | Q: 8
Solution Two Squares Have Sides X Cm and (X + 4) Cm. the Sum of Their Area is 656 Sq. Cm. Express this as an Algebraic Equation in X and Solve the Equation to Find the Sides of the Squares. Concept: Quadratic Equations.
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