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Solve the equation 22x - 3(2^x+2) + 32 = 0.

Mathematics

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Answer

x=2,3x=2, 3

Step-by-step solution

4 steps
  1. Rewrite the terms in the equation using exponent rules.

    Recall that amn=(am)na^{mn} = (a^m)^n and am+n=am⋅ana^{m+n} = a^m \cdot a^n.

    22x−3(2x+2)+32=02^{2x} - 3(2^{x+2}) + 32 = 0 (2x)2−3(2x⋅22)+32=0(2^x)^2 - 3(2^x \cdot 2^2) + 32 = 0 (2x)2−3(4⋅2x)+32=0(2^x)^2 - 3(4 \cdot 2^x) + 32 = 0 (2x)2−12(2x)+32=0(2^x)^2 - 12(2^x) + 32 = 0
  2. Let y=2xy = 2^x to transform the equation into a quadratic form.

    y2−12y+32=0y^2 - 12y + 32 = 0
  3. Solve the quadratic equation for yy.

    We can factor the quadratic expression.
    We need two numbers that multiply to 32 and add up to -12. These numbers are -4 and -8.

    (y−4)(y−8)=0(y - 4)(y - 8) = 0

    This gives two possible values for yy:

    y−4=0  ⟹  y=4y - 4 = 0 \implies y = 4 y−8=0  ⟹  y=8y - 8 = 0 \implies y = 8
  4. Substitute back y=2xy = 2^x and solve for xx.

    Case 1: y=4y = 4

    2x=42^x = 4

    Since 4=224 = 2^2, we have:

    2x=222^x = 2^2 x=2x = 2

    Case 2: y=8y = 8

    2x=82^x = 8

    Since 8=238 = 2^3, we have:

    2x=232^x = 2^3 x=3x = 3

    The solutions for xx are 2 and 3.

    x=2,3x=2, 3
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