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rezolvati: x+5(x-4)² - 4(x-3)² = (2x-5)² - 3(2-x)² + 10


Răspuns :

x + 5 (x² -8x +16) -4(x² -6x +9) = 4x² -20 x +25 -3 ( 4 -4x +x²) +10
x + 5x² - 40 x +80 -4x² +24x - 36 = 4x² -20x +25 - 12 + 12x -3x² +10
x² - 15x +44 = x² -8x +23
x²-x² -15x +8x= 23 -44
-7x = -21
7x = 21
x = 21/7
x=3