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Question

Two squares have sides x cm and (x+4) cm. The sum of their areas is 656cm2.The value of x is:

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Solution

Side of first square =xcm
Side of second square =(x+4)cm
According to the question,
x2+(x+4)2=656
x2+x2+8x+16=656
2x2+8x+16656=0
2x2+8x640=0
x2+4x320=0
x2+20x16x320=0
x(x+20)16(x+20)=0
(x+20)(x16)=0
x+20=0 and x16=0
x=20 and x=16
Side cannot be negative.
x=16



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