for what value of k, x=a is a solution of equation x^2-(a+b)x + k=0?
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Solution :
If x = a ,
value of x² - ( a + b )x + k = 0 is
[ put x = an given equation ]
a² - ( a + b )a + k = 0
=> a² - a² - ab + k = 0
=> -ab + k = 0
=> k = ab
••••
If x = a ,
value of x² - ( a + b )x + k = 0 is
[ put x = an given equation ]
a² - ( a + b )a + k = 0
=> a² - a² - ab + k = 0
=> -ab + k = 0
=> k = ab
••••
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