queenfefe83 queenfefe83
  • 08-07-2020
  • Mathematics
contestada

[tex]2x^{2} +12x-7=0 \\[/tex] give your answer to 2 decimal places

Respuesta :

mhanifa
mhanifa mhanifa
  • 08-07-2020

Answer:

-2. 46

- 9.54

Step-by-step explanation:

  • 2x²+12x-7=0
  • 2x²+12x+18= 25
  • 2*(x²+6x+9)=25
  • 2*(x+6)²= 5²
  • x+6= 5√2/2 ⇒ x= 5√2/2 -6 ≈ -2. 46
  • x+6= -5√2/2 ⇒ x= -5√2/2 -6 ≈ - 9.54
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