chris54660
chris54660 chris54660
  • 14-01-2022
  • Mathematics
contestada

I don’t understand how to solve that with proportion math

I dont understand how to solve that with proportion math class=

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evatait03
evatait03 evatait03
  • 14-01-2022
it cropped some of it out but here’s my work
answer: -12 and 17
Ver imagen evatait03
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isaacdeyarmin95
isaacdeyarmin95 isaacdeyarmin95
  • 14-01-2022

Answer:

Step-by-step explanation:

x-9/3=56/x+4;  (x-9/3)*3/1=(56/x+4)*3/1;  x-9= 168/x+4;  

(x-9)*(x+4)=(168/x+4)*(x+4);  x^2+4x-9x-36=168; x^2-5x-36-168=168-168;

x^2-5x-204=0; x=17 or x= -12

yes i know there is a bit missing i just put it into a graphing calculator at the last part

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