Respuesta :

Answer: 9

Step-by-step explanation:

x2+6x+(3)2=15+(3)2

x2+6x+9=24

(x+3)2=24

x=±2√6−3

x=±2√6−3 is final answer

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Answer:

Add 9 to each side

Step-by-step explanation:

x^2 + 6x = 15

Take the coefficient of x

6

Divide by 2

6/2 =3

Square it

3^2=9

Add 9 to each side

x^2 + 6x+9 = 15+9

(x+3) ^2 = 24

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