Find the product of (x + 9i)^2
Find the product of (x+(3+5i))^2
1 answer:
Remember that

so

(a+ b)^2 = a^2 + 2ab + b^2
1. x^2 + 2x*9i + (9i)^2 = x^2 + 18xi - 81
2. x^2 + 2x*(3+5i)+ (3+5i)^2 = x^2 + 6x + 10xi+ 9+30i-25 = x^2 - 16 + 30i + 6x + 10xi
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