Q. 124.0( 5 Votes )

For what value of k, x = a is a solution of the equation

x2 – (a + b) x + k = 0.

Answer :

x2 – (a + b)x + k = 0

Put x = a

a2 – (a + b) a + k

a2 – a2 + ab + k = 0

ab + k = 0

k = –ab

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