Zapisz wyrażenie w jak najprostszej postaci i oblicz jego wartość:
a)5x-(x-y)+(-2x+3y)-8
b)
a)
5x-(x-y)+(-2x+3y)-8 = 5x –x + y -2x + 3y – 8 = 2x + 4y – 8
2a(4 + a²) – 3(4a- a²) + a (a²-1) = 8a + 2a³ - 12a + 3a² + a³ - a =
= -5a + 3a³ +3a²
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a)
5x-(x-y)+(-2x+3y)-8 = 5x –x + y -2x + 3y – 8 = 2x + 4y – 8
b)
2a(4 + a²) – 3(4a- a²) + a (a²-1) = 8a + 2a³ - 12a + 3a² + a³ - a =
= -5a + 3a³ +3a²