Mathematics: Factor the expression over the complex numbers x^2+20

Factor the expression over the complex numbers x^2+20

Ответ:

michello3

02.01.2022

Mathematics

$(x - 2i\sqrt{5} )(x+2i\sqrt{5} )$

Step-by-step explanation:

To do that you need to use this:

$x^{2} -y^{2} =(x-y)(x+y)$

In order to do the substraction you need to put a minus to 20

$x^{2}+20 \\=x^{2} - (-20) \\=(x-\sqrt{-20} )(x+\sqrt{-20} ) \\=(x - 2i\sqrt{5} )(x+2i\sqrt{5} ); \\\\\\\sqrt{-20} =\sqrt{(-1)(2^{2})(5)} =2i\sqrt{5}$

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Ответ:

tyrique86

27.05.2023

Mathematics

2x+18+5x-9

2x+5x18-9

7x+9

7. 7

x= 1.4

hope it helps

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Factor the expression over the complex numbers x^2+20

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