crystalhoff6176
19.08.2019 •
Mathematics
Find the product mentally.
(2j + 7)(2j - 7)
a: 4j2 + 49
b: 4j2 - 49
c: 2j2 - 28j - 49
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Ответ:
=(2j+7)(2j+−7)
=(2j)(2j)+(2j)(−7)+(7)(2j)+(7)(−7)
=4j2−14j+14j−49
=4j2−49
Ответ:
Good luck