а) (5x-2)(5x+2) - (5x-1)2 = 425x^2 - 4 - 25x^2 + 10x - 1 = 4-4 + 10x - 1 = 410x - 5 = 410x = 9x = 9/10
б) 100x^2 - 16 = 0100x^2 = 16x^2 = 16/100x^2 = 0.16x = √0.16x = ±0.4
а) (5x-2)(5x+2) - (5x-1)2 = 4
25x^2 - 4 - 25x^2 + 10x - 1 = 4
-4 + 10x - 1 = 4
10x - 5 = 4
10x = 9
x = 9/10
б) 100x^2 - 16 = 0
100x^2 = 16
x^2 = 16/100
x^2 = 0.16
x = √0.16
x = ±0.4