If all real values of x obtained from the equation 4^x – (a – 3)2^x +a – 4 = 0 are non – positive then a lies in a)(4,5] b)(0,4) c)(4,infinity) d)none of these

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Arun · Answer

let 2^x = t then t^2 – (a – 3)t + a – 4 = 0 t^2 + t – (a – 4)t + a – 4 = 0 t (t + 1) – (a – 4) (t + 1) = 0 t = – 1 and t = a – 4 2^x = a – 4 0 4

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If all real values of x obtained from the equation 4^x – (a – 3)2^x +a – 4 = 0 are non – positive then a lies in a)(4,5] b)(0,4) c)(4,infinity) d)none of these

If all real values of x obtained from the equation
4^x – (a – 3)2^x +a – 4 = 0 are non – positive then a lies in
a)(4,5]
b)(0,4)
c)(4,infinity)
d)none of these

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If all real values of x obtained from the equation 4^x – (a – 3)2^x +a – 4 = 0 are non – positive then a lies in a)(4,5] b)(0,4) c)(4,infinity) d)none of these

If all real values of x obtained from the equation4^x – (a – 3)2^x +a – 4 = 0 are non – positive then a lies in a)(4,5]b)(0,4)c)(4,infinity)d)none of these

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If all real values of x obtained from the equation
4^x – (a – 3)2^x +a – 4 = 0 are non – positive then a lies in
a)(4,5]
b)(0,4)
c)(4,infinity)
d)none of these