Q. Simplify the expression to a + bi form:(5−6i)(−9−9i)Answer:
Apply Distributive Property: To simplify the expression (5−6i)(−9−9i), we will use the distributive property (also known as the FOIL method for binomials), which states that for any complex numbers a,b,c, and d,(a+bi)(c+di)=ac+adi+bci+bdi2. Let's multiply the real parts and the imaginary parts accordingly. Calculation: (5)(−9)+(5)(−9i)+(−6i)(−9)+(−6i)(−9i)
Calculate Real and Imaginary Parts: Now we will calculate each part separately.First, multiply the real parts: (5)(−9)=−45.Second, multiply the real part of the first term by the imaginary part of the second term: (5)(−9i)=−45i.Third, multiply the imaginary part of the first term by the real part of the second term: (−6i)(−9)=54i.Fourth, multiply the imaginary parts: (−6i)(−9i)=54i2. Remember that i2=−1.
Combine and Substitute: Combine the results from the previous step and substitute i2 with −1.Calculation: −45−45i+54i+54(−1)
Simplify Expression: Simplify the expression by combining like terms.Calculation: −45−45i+54i−54Combine the real parts: −45−54=−99.Combine the imaginary parts: −45i+54i=9i.
Final Result: Write the final result in a+bi form.Calculation: −99+9i
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