alaina41205 alaina41205
  • 23-07-2020
  • Mathematics
contestada

solve x^2+5x-2=0 Enter your answers,as exact values, in the boxes.

Respuesta :

altavistard
altavistard altavistard
  • 23-07-2020

Answer:

                 √33

x = -5/2 ± ---------

                     2

Step-by-step explanation:

Through completing the square, we get:

x^2 + 5x + (5/2)^2 - (5/2)^2 - 2 = 0, or

(x + 5/2)^2 - 25/4 - 2 = 0.

This simplifies to

(x + 5/2)^2 = 33/4

Taking the square root of both sides yields:

x + 5/2 = ±√(33/4), which can be solved explicityl for x:

                 √33

x = -5/2 ± ---------

                     2

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