Question

Resolva a equação (3x -1) . (3x+1) - 2 . (2x-7)= x . (9x-7)

Answer 1

(3x - 1).(3x + 1) - 2.(2x - 7) = x.(9x - 7)
(3x)² - 1² - 4x + 14 = 9x² - 7x
9x² - 1 - 4x + 14 = 9x² - 7x
13 - 4x = - 7x
- 4x + 7x = - 13
3x = - 13
x = - 13
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