Thursday, November 27, 2014

Solve for x the equation 289^x - 17^(x+1) + 16 = 0?

We have to solve the equation 289^x - 17^(x+1) + 16 = 0.
Notice that 289 = 17^2.


Rewrite the equation that is given
in the following way to arrive at a quadratic
equation.


289^x - 17^(x+1) + 16 =
0


(17^2)^x - 17^(x+1) + 16 =
0


(17^x)^2 - 17^x*17 + 16 =
0


Let 17^x = y


y^2 - 17y + 16
= 0


y^2 - 16y - y + 16 = 0


y(y
- 16) - 1(y - 16) = 0


(y - 1)(y - 16) =
0


y = 1 and y = 16


As y =
17^x


17^x = 1 and 17^x = 16


x
= 0 and x =


The equation has two
solutions x = 0 and x =

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