Mathematics
29.06.2020 17:56
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Find the product mentally. (2j + 7)(2j - 7) a: 4j2 + 49 b: 4j2 - 49 c: 2j2 - 28j
Find the product mentally.
(2j + 7)(2j - 7)
a: 4j2 + 49
b: 4j2 - 49
c: 2j2 - 28j - 49
Show Answers
(2j + 7)(2j - 7)
a: 4j2 + 49
b: 4j2 - 49
c: 2j2 - 28j - 49
pretti78
4,6(13 marks)
(2j+7)(2jβ7)
=(2j+7)(2j+β7)
=(2j)(2j)+(2j)(β7)+(7)(2j)+(7)(β7)
=4j2β14j+14jβ49
=4j2β49
=(2j+7)(2j+β7)
=(2j)(2j)+(2j)(β7)+(7)(2j)+(7)(β7)
=4j2β14j+14jβ49
=4j2β49
alexkrol10
5,0(75 marks)
3 3/4
Step-by-step explanation: You add the first two by adding the numerators and that would equal 4/4. 4/4 equals 1 whole so the first answer is 2 then you would add the last fraction. You add the whole numbers first so it would be 3 and then just copy the last fraction so it would be 3 3/4.
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