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-10i + 15 j -16i +25 j
-26i + 40 j
b) 3(i+3j) + 4(-2i+3j) + 5 (4i-5j)
3i + 9j -8i + 12j + 20i -25j
15i -4j
c) 2(i+3j) - (5(4i-5j))
2i + 6j - 20 i + 25 j = -18i + 31j
d) i+3j + 6(4i-5j)
i+3j + 24i -30 j = 25 i - 27 j