1)
A = (3x - 5)² - (5x-2)(7x+9)
A = 9x² -30x +25 - (35x² +45x - 14x -18)
A = 9x² -30x + 25 - 35x² - 31x + 18
A = -26x² -61x + 43
2)
(2x-5)² = 2* (2x² - 1)
4x² - 20x + 25 = 4x² - 2
-20x = -27
x = 27/20
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1)
A = (3x - 5)² - (5x-2)(7x+9)
A = 9x² -30x +25 - (35x² +45x - 14x -18)
A = 9x² -30x + 25 - 35x² - 31x + 18
A = -26x² -61x + 43
2)
(2x-5)² = 2* (2x² - 1)
4x² - 20x + 25 = 4x² - 2
-20x = -27
x = 27/20