The difference between a number and its square is 72 .What is the number ?
Solution
Correct Answer: Option D
মনে করি ,সংখ্যাটি =x
প্রশ্নমতে,
x²-x=72
বা,x²-x-72 =0
বা, x²-9x+8x-72 =0
বা,x(x-9)+8(x-9)=0
বা,(x-9)(x+8)=0
∴ x =9 [since x ≠ -8]
প্রশ্নমতে,
x²-x=72
বা,x²-x-72 =0
বা, x²-9x+8x-72 =0
বা,x(x-9)+8(x-9)=0
বা,(x-9)(x+8)=0
∴ x =9 [since x ≠ -8]
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