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(a+b)²= a²+2ab+b²
(a-b)²=a²-2ab+b²
(a-b)(a+b)=a²-b²
a)
(x- )²=x²-2**x+ =x² - x+
b)
(x + )(x - ) = x² -
c)
(x+)² = x²+x +
2.
a)
(x-2)² - x² = 0
(x-2)² = x²
x²-4x+4 = x² | - x²
-4x+4 = 0
-4x = -4 | : (-4)
x = 1
b)
(x-1)(x+1)=x²-4x+5
x²-1 = x²-4x+5 | - x²
-1 = -4x +5
4x = 5 + 1
4x = 6 | : 4
x = 1.5