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By making the substitution $u = 4^x$, solve the equation $4^x + 4^2 = 4^{x+2}$, and give your answer correct to 3 significant figures.
Mathematics 9709 · AS & A Level · Logarithmic and exponential functions
Mathematics 9709 · AS & A Level · Logarithmic and exponential functions
By making the substitution $u = 4^x$, solve the equation $4^x + 4^2 = 4^{x+2}$, and give your answer correct to 3 significant figures.