drish67 drish67
  • 13-03-2021
  • Mathematics
contestada

x^2-6x=b, make x the subject

Respuesta :

cwrw238 cwrw238
  • 13-03-2021

Answer:

x =  3 ±√(b + 9).

Step-by-step explanation:

We use Completing the Square:

x^2 - 6x = b

(x - 3)^2 - 9 = b

(x - 3)^2 = b + 9    Taking square roots of both sides:

x - 3 = ±√(b + 9)

x =  3 ±√(b + 9).

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