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Find the product mentally. (2j + 7)(2j - 7) A: 4j2 + 49 B: 4j2 - 49 C: 2j2 - 28j - 49
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1 vote
Find the product mentally.

(2j + 7)(2j - 7)

A: 4j2 + 49
B: 4j2 - 49
C: 2j2 - 28j - 49

User Atirag
by
8.6k points

2 Answers

0 votes

Answer:

B

Explanation:

2j*2j=4j^2

7*-7=-49

User Charles Crete
by
8.6k points
7 votes
(2j+7)(2j−7)

=(2j+7)(2j+−7)

=(2j)(2j)+(2j)(−7)+(7)(2j)+(7)(−7)

=4j2−14j+14j−49

=4j2−49

User Englund
by
7.8k points
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