Dividing integers is the opposite of multiplying integers.
First we note symmetry in the expression's coefficients.
We also note that 7*3=21, and 7+3=10.
From the rational roots theorem, we are tempted to try with 3 and 7 as coefficients of the factors.
Try
(7b+3)(3b+7)=21b^2+(49+9)b+21
By switching the sign of 3b+7 to 3b-7, we get the signs right, to check:
(7b+3)(3b-7)=21b^2+(9-49)b-21=21b^2-40b-21 ....right!
So
(7b+3)(3b-7)=21b^2-40b-21
Answer:
9 - 11i
Step-by-step explanation:
(3 - 9i) + (6 - 2i)
= (3 + 6) + (-9i - 2i)
= 9 - 11i
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Answer:
c,d,f
Step-by-step explanation: