bufjasmine bufjasmine

05-05-2015
Mathematics

Answered

What is a simpler form of the following expressions?
(j + 7)(j - 7)

a. j² +14j - 49
b. j² - 14j - 49
c. j² + 14j - 49
d. j²- 49

Answer :

Nellz01 Nellz01

05-05-2015

j x j = j^2
j x -7 = -7j
7 x -7 = -49
j x 7 = 7j
j^2 - 7j + 7j - 49 = D = j^2 - 49

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