Which are the solutions of x2 = -7x – 8? 17 7
V17
+
2. 4
를- 1명,글 부
(
7 - 17 7 + y17
2
-7 - V17 -7 + V17
2.
2.

4−i

Step-by-step explanation:

Use the formula for the distance of a complex number from the origin on the complex plane.

\sqrt{a^2+b^2}

a

2

+b

2

a+bia+bi

4-i4−i

\sqrt{4^2-i^2}

4

2

−i

2

\sqrt{4^2+(-1)^2}=\sqrt{16+1}=\sqrt{17}

4

2

+(−1)

2

=

16+1

=

17

The complex number that has a distance of \sqrt{17}

17

is 4-i4−i .

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step-by-step explanation:

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.