Question

for what value of k, x=a is a solution of equation x^2-(a+b)x + k=0?

Answer 1

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

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