3. If a=4-i and b=10+3i, then which of the following is the value of 3a-4b? -28+9i -21-15i (2)-28-15i -21+9i 3(4-1)-4 (10+31) = là -3i-40-li 4. If z₁ = a + bi and z₂ = c+di represent two complex numbers with real components a, b, c and d, then which of the following represents the coefficient of i in the product of z, and z₂? (1) ac-bd (3) ab+cd Jamal (2) ad-bc (4) bc + ad COMMON CORE ALGEBRA II, UNIT ASSESSMENTS- UNIT #9-FORM C eMATHINSTRUCTION, RED HOOK, NY 12571, © 2018

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