rozwiąż ukł.: równań:
3+x=y-1
-2-y=x(razy)y
2. korzystając ze wzoru skróconego mnożenia, oblicz:
2x-pierwiastek z (1-2x+x do kwadratu)
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z.1
3 + x = y - 1 --> y = x + 4
-2 - y = x*y
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-2 - (x + 4) = x*(x + 4)
- 6 - x = x^2 + 4x
x^2 + 5x + 6 = 0
( x +2)*(x +3) = 0
x = - 2 lub x = - 3
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y = -2 + 4 = 2 lub y = -3 + 4 = 1
Odp. x = -2 i y = 2
lub x = -3 i y = 1
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z.2
2x - p(1 - 2x + x^2 ) = 2x - p[ (1 - x)^2] = 2x - I 1 - x I
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