Two squares have sides x cm and (x+4)cm the sum of their area is 656 cm2 find the side of the square
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x*x + (x+4)(x+4)= 656
x*x + x*x+ 16+ 8x = 656
2x*x + 8x = 656-16
2x*x + 8x = 640
x*x + 4x - 320=0
x*x + 20x-16x-320 =0
x(x+20)-16(x+20)=0
x= -20 & x=16
the side of squares are 16 & 20
x*x + (x+4)(x+4)= 656
x*x + x*x+ 16+ 8x = 656
2x*x + 8x = 656-16
2x*x + 8x = 640
x*x + 4x - 320=0
x*x + 20x-16x-320 =0
x(x+20)-16(x+20)=0
x= -20 & x=16
the side of squares are 16 & 20
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