toogood5689 toogood5689
  • 07-08-2019
  • Mathematics
contestada

Solve x2 + 9x + 20 = 0. x = 2, x = 10 x = −2, x = −10 x = −5, x = −4 x = 5, x = 4

Respuesta :

Аноним Аноним
  • 07-08-2019

x^2+9x+20= 0

(x+4)(x+5)= 0

x+4= 0

Move +4 to other side. Sign changes from +4 to -4.

x+4-4= 0-4

x= -4

x+5= 0

Move +5 to other side. Sign changes from +5 to -5.

x+5-5= 0-5

x= -5

Answer : x= -5, x= -4

Answer Link
donnaw12 donnaw12
  • 17-04-2020

Answer:

x=4 x=5

Step-by-step explanation:

Answer Link

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