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Find the value of 'a' so that Find t...

Find the value of 'a' so that
Find the values of a and b so that the function defined by
` f (x) = {{:(ax^(2) + 9x - 5 " if " x lt 1 ), (b " if " x = 1 ),((x + 3) (2x -9) " if " x gt 1 ):}` is continuous on R .

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The correct Answer is:
`-1//2`
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