(4^x-8)^2-10 4^x-8 =3*4^x-36

3 min read Jul 03, 2024
(4^x-8)^2-10 4^x-8 =3*4^x-36

Solving the Equation: (4^x-8)^2-104^x-8 = 34^x-36

In this article, we will solve the equation (4^x-8)^2-104^x-8 = 34^x-36. This equation involves exponentiation, quadratic terms, and linear terms, making it a challenging problem to solve.

Step 1: Expand the Left-Hand Side

First, we need to expand the left-hand side of the equation using the exponent rule (a-b)^2 = a^2 - 2ab + b^2.

(4^x-8)^2 = (4^x)^2 - 2(4^x)(8) + 8^2 = 4^(2x) - 16*4^x + 64

Step 2: Simplify the Left-Hand Side

Now, we simplify the left-hand side by combining like terms.

4^(2x) - 164^x + 64 - 104^x - 8 = 4^(2x) - 26*4^x + 56

Step 3: Equate the Two Expressions

Next, we equate the simplified left-hand side with the right-hand side of the equation.

4^(2x) - 264^x + 56 = 34^x - 36

Step 4: Move All Terms to One Side

We move all terms to the left-hand side and set the equation equal to zero.

4^(2x) - 29*4^x + 92 = 0

Step 5: Factor the Quadratic Expression

Now, we try to factor the quadratic expression.

(4^x - 4)(4^x - 23) = 0

Step 6: Solve for x

Finally, we solve for x by setting each factor equal to zero and solving for x.

4^x - 4 = 0 --> 4^x = 4 --> x = 1

4^x - 23 = 0 --> 4^x = 23 --> x = log4(23)

Therefore, the solutions to the equation are x = 1 and x = log4(23).

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