9514 1404 393
Answer:
- (s+r)(x) = 3x² +x +1
- (s-r)(x) = -3x² +x +1
- (s·r)(-3) = -54
Explanation:
a) (s+r)(x) = s(x) +r(x) = (x+1) +3x²
(s+r)(x) = 3x² +x +1
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b) (s-r)(x) = s(x) -r(x) = (x +1) -(3x²)
(s-r)(x) = -3x² +x +1
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c) (s·r)(-3) = s(-3)·r(-3) = (-3+1)·(3(-3)²) = (-2)(27)
(s·r)(-3) = -54