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12-88.
  1. Solve the equations below. Homework Help ✎

    1. = 3

    2. (x + 2)2 + (x – 2)2 = (2x)2

    3. 3x3 + 12x = 21x2 + 84

    4. 10ln(4) + ln(x) = 16

Multiply both sides by (x + 2)(x − 2).

3x(x − 2) + 7(x + 2) = 3(x + 2)(x − 2)
3x² − 6x + 7x + 14 = 3(x2 − 4)
3x2 + x + 14 = 3x2 − 12

x = −26

x = 10, x = 3