Question 234969
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1.  Hint:

*[tex \LARGE 5\ \times\ 1\ =\ 5],


*[tex \LARGE (5\ \times\ -5)\ +\ (-10\ \times\ 1)\ =\ -25\ +\ -10\ =\ -35], and


*[tex \LARGE -10\ \times\ -5\ =\ 50]


Finally, you can take a 5 out of one of the binomial factors.


2.  Hint:


*[tex \LARGE -3\ \times\ 1\ =\ -3],


*[tex \LARGE (-3\ \times\ -5)\ +\ (15\ \times\ 1)\ =\ 15\ +\ 15\ =\ 30], and


*[tex \LARGE 15\ \times\ -5\ =\ -75]


Finally, you can take a -3 out of one of the binomial factors.  


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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