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log2 x = 4
2^4 = x
x = 16
logx 64 = 3
x^3 = 64
x^3 = 4^3
x = 4
(2x + 1)² = (2x)² + 2 * 2x * 1 + 1² = 4x ² + 4x + 1
(3x - 2y)² = (3x)² - 2 * 3x * 2y + (2y)² = 9x² - 12xy + 4y²
(2x - 5)(2x + 5) = (2x)² - 5² = 4x² - 25
(1/3)^x=81
3^-x=81
3^-x=3^4
-x=4 /*(-1)
x= -4
2^4=x
x=16
x^3=64
x^3=4^3
x=4
^-potega
(2x+1)^2=4x^2+4x+1
(3x-2y)^2=9x^2-12xy+4y^2
(2x-5)(2x+5)=4x^2-25