ashleymtzclavijo439 ashleymtzclavijo439
  • 23-05-2021
  • Mathematics
contestada

Solve x 2 - 4x - 7 = 0 by completing the square. What are the solutions?


A){2 +√11 , 2 - √11}

B){-2 +√11 , -2 - √11}

C){2 + √11, 2 +√11 }

Respuesta :

unicorn3125
unicorn3125 unicorn3125
  • 24-05-2021

Answer:

        A) {2 +√11 , 2 - √11}

Step-by-step explanation:

[tex]x^2 - 4x-7=0\\\\\underline{x^2 - 2\cdot x\cdot2+2^2}-2^2-7 =0\\\\\big(x-2\big)^2-4-7=0\\\\ \big(x-2\big)^2=11\\\\ x-2=\pm\sqrt{11}\\\\ x=2\pm\sqrt{11}[/tex]

Answer Link

Otras preguntas

A patio is in the shape of a trapezoid. The length of the longer base is 18 feet. The length of the shorter base is two feet less than half the longer base. The
_________ pagaba las cuentas del hotel con tarjeta de crédito. El mes pasado Anoche De vez en cuando Hoy
Can someone please help me with these
A transaction in which an owner transfers his or her personal property to another to be held, stored, or delivered is known as
On a pay stub, what is the difference between “Net pay” and YTD net pay.
hello can you please help me posted picture of question
Angela is 10 and has been a victim of sexual abuse. the long-term effects ________
Between the civil war and world war i, the u.s. monetary system:
To win the Civil War, the South was counting on the fact that
The diagram below represents the first three terms of a sequence. Assuming the pattern continues,which formula determines an, the number of squares in the nth t