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parte 1 parte 2
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(3x-1)^2 - 3 (2x+3)^2 + 42
(9x^2 - 6x + 1) - 3 (4x^2 + 12x + 9) + 42
9x^2 - 6x + 1 - 12x^2 - 36x - 27 + 42
9x^2 - 12x^2 - 6x - 36x +1 - 27 + 42
- 3x^2 - 26 = parte 1
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2x (-x-5) - (x-1)^2
- 2x^2 - 10x - (x^2 - 2x + 1)
- 2x^2 - 10x - x^2 + 2x - 1
- 3x^2 - 8x - 1 = parte 2
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parte 1 = parte 2
- 3x^2 - 26 = - 3x^2 - 8x - 1
- 3x^2 + 3x^2 + 8x = 26 - 1
8x = 25
x = 25 / 8
x = 3,125
Espero que te ayude está respuesta