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stepladder [879]
3 years ago
14

Can someone please explain how to do these? I forgot how go

Mathematics
1 answer:
777dan777 [17]3 years ago
6 0
Use Cosine, Adjacent/hypotenuse.

The cos=0.6

Angle is 53.13°
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we would like to factor the following:

\rm\displaystyle ( {a}^{2}  +  {b}^{2}  {)}^{2}  - 18( {a}^{2}  +  {b}^{2} ) - 88

let a²+b²=x

thus substitute:

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substitute back:

\rm\displaystyle(  {a}^{2}  +  {b}^{2} - 22)( {a}^{2}  +  {b}^{2}   +  4)

and we are done!

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The answer would be letter B.

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15b=55
----- ----
5 5
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