one day i asked the son of my close friend about his age he said that one years ago my dad was 8 times as old as mje and how his age is equal to the square of my age find the age of son
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x²=x
(x²-1)=8(x-1)
x²-1=8x-8
x²-8x+7=0
x²-7x-1x+7=0
x(x-7)-1(x-7)=0
x=1,7
∴ x=1,x²=1 (neglected)
∴ x=7
(x²-1)=8(x-1)
x²-1=8x-8
x²-8x+7=0
x²-7x-1x+7=0
x(x-7)-1(x-7)=0
x=1,7
∴ x=1,x²=1 (neglected)
∴ x=7
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