Answers

2016-06-30T22:08:53+08:00
Substitute. 5(4) - 7(4) = 20-28 = -8
5(-3) - 7(-3) = -15 + 21 = 6
0
2016-07-01T18:29:09+08:00
F(4)= 5(4)-7(4)
f(4)= 20-28
f(4)= -8
------
f(-3)= 5(-3) - 7(-3)
f(-3)= -15 - (-21)
f(-3)= -15+21
f(-3)= 6
0