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Mars2501 [29]
3 years ago
9

Solve. x² + 6x + 9 = 12 (Choices in photo)

Mathematics
2 answers:
Irina18 [472]3 years ago
6 0
X^2 + 6x + 9 = 12

X^2 + 6x - 3 = 0

(-6 ± <span>√(6^2 - 4*1*-3) ) / 2

3 </span>± √(48) / 2<span>

</span>3 ± 4√(3) / 2

3 ± 2√(3)
jeyben [28]3 years ago
6 0
To solve this problem and to calculate the value of the variable "x", you must apply the following proccedure:

 1. You have the quadratic equation:
<span>
 x²+6x+9=12

 2. Then:

 </span>x²+6x+9-12=0
 x²+6x-3=0
<span>
 3. You must apply the quadratic formula, which is:

 (-b±√(b^2-4ac))/2a

 a=1
 b=6
 c=-3

 4. Then, the result is:

 x=-3</span>±2√3
<span>
 Therefore, the correct option is the first one: </span>x=-3±2√3
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Answer:

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\huge\boxed{x=8;\ y=1\to(8;\ 1)}

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