Diketahui vektor a = (1,2),b = (0,2), dan c = (1,-2) tentukan a. 2a + b b. A - 2b

a = i + 2j
b = 2j

a. 2a + b
= 2(i + 2j) + 2j
= 2i + 4j + 2j
= 2i + 6j
2a + b = (2, 6)


b. a - 2b
= i + 2j - 2(2j)
= i + 2j - 4j
= i - 2j

a - 2b = (1, -2)

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a) 2a + b = 2(1,2) + (0,2)
= (2,4) + (0,2)
= (2,6)
b) a - 2b = (1,2) - 2(0,2)
= (1,2) - (0,4)
= (1,-2)