Question: a. Using the substitution u = 2 x , show that the equation 4 x 2 x + 1 15 = 0 can

a. Using the substitution u = 2x, show that the equation 4x − 2x + 1 − 15 = 0 can be written in the form u2 − 2u − 15 = 0.

b. Hence solve the equation 4x − 2x + 1 − 15 = 0, giving your answer to 2 decimal places.

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