serinasantiago
serinasantiago serinasantiago
  • 01-05-2020
  • Mathematics
contestada

pls only do this if yk how to bc i’m giving best answer brainliest !

solve the equation :
-10x-47=-x^2+1 to the nearest tenth

thank you :))

Respuesta :

valeryswilliams
valeryswilliams valeryswilliams
  • 01-05-2020

Answer:

x=-3.5, x=13.5

Step-by-step explanation:

-10x-47=-x^2+1

switch sides

-x^2+1=-10x-47

add 47 to both sides

-x^2+1+47=-10x-47+47

simplify

x^2+48=-10x

add 10x to both sides

-x^2+48+10x=-10x+10x

simplify

-x^2+10x+48=0

solve with the quadratic formula

a=-1, b=10, c=48:

x=-10±√10²-4(-1)48/ 2(-1)

(you can plug this into a calculator or use PEMDAS to solve)

(solve it twice: use - once, and + the second time)

answer:

x=-3.5, x=13.5

Answer Link

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