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Question
Solve 2x2 – 9x + 10 =0; when x ∈ Q
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Solution
2x2 – 9x + 10 =0
`=> 2x^2 - 5x - 4x - 10 = 0`
`=> x(2x - 5) - 2(2x - 5) = 0`
`=> (2x - 5)(x - 2) = 0`
then x = 5/2 and x = 2
Since `x in Q " then " x = 5/2 and 2`
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