Explain.

Question

1.) To solve x(x-5)=0 either factor may be equal to zero.

2.) | 8-15i | = 17

3.) The solution for x^2 = -2 cannot be found graphically.

[any help or explanation is greatly appreciated]

Answer 1

(1) is self explanatory.

(3) If you are graphing real numbers, there are none for which the square is negative.

For (2), the || symbols signify the magnitude of the complec number inside. In this case, it is the square root of 8^2 + 1562.