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6+5i
I assume that "I" is a variable2+5i+6+3i7i+6+3i10i+616i is the answer
12
0.4
p = (2 + 5i)q = (6 - i)pq = (2 + 5i) (6 - i)pq = 12 + 30i - 2i - 5i2pq = 12 + 28i + 5pq = 17 + 28iIts the same as multiplying polynomials. Just multiply all the combinations of terms, group, and simplify.