Tolongg dongg bantuu jawab

suku banyak
1.
f(x) = x³ - 2x² + x- 1
g(x)= x³- x² +2x -2
................................(+)
f(x)+g(x) = 2x³ - 3x² + 3x  - 3

2.
f(x)= x⁵ - x³ -2x - 1
f(-1)= (-1)⁵ - (-1)³ -2(-1) -1
f(-1)= -1 + 1 + 2 - 1
f(-1)= 1

3.
x³ + 2x² - 5x - 6 = (x +1)(x-2)(x+p)
-6 = (1)(-2)(p)
-6 = -2p
p = -6/-2
p = 3

4.
f(x) = 2x³ + x² - 5x - 2
2x -1 = 0 --> x = 1/2
f(1/2) = 2(1/2)³ +(1/2)² -5(1/2) - 2
f(1/2) = 2(1/8) + 1/4 - 5/2 - 2
f(1/2) = 1/4 + 1/4 - 5/2 - 2
f(1/2)  = 1/2 - 5/2 - 2
f(1/2) = -4/2 - 2
f(1/2) = -2 -2
f(1/2)= - 4
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