Which of the following is a quadratic equation? X - 4/x =5 ; x doesn’t = 0
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Q. Which of the following is a quadratic equation? x - 4/x =5 ; x doesn’t = 0
solution:-
=> x - 4/x = 5
=> (x × x)/x - 4x/x = 5
=> (x² - 4x)/x = 5
multiply both side by x
=> x² - 4x = 5x
=> x² - 4x - 5x = 0
=> x² - 9x = 0
=> x ( x - 9 ) = 0
=> x = 0 or x - 9 = 0
but we know by question x ≠ 0
hence, x - 9 = 0
=> x = 9
i hope it helps you.
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