Czołem!
a)
f(x) = x² + √2x
x² + √2x = 0
x(x + √2) = 0
x = 0 v x = -√2
b)
f(x) = -2(x - 3)² + 18
f(x) = -2(x² - 6x + 9) + 18
f(x) = -2x² + 12x - 18 + 18
f(x) = -2x² + 12x
-2x² + 12x = 0
-2x(x - 6) = 0
x = 0 v x = 6
c)
f(x) = 2x² + 8
2x² + 8 = 0 | : 2
x² + 4 = 0
x² = -4
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