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polet [3.4K]
4 years ago
15

Solve the equation by completing the square

Mathematics
1 answer:
Ilya [14]4 years ago
4 0

Answer:

We got the quadratic equation:

x^2+8x-3=0

Solving by completing the square:

x^2+8x-3=0\\x^2+8x+16-16-3=0\\(x+4)^2-16-3=0\\(x+4)^2-19=0\\(x+4)^2=19\\x+4=\pm \sqrt{19} \\x=-4\pm \sqrt{19} \\\\x_{1} =-4+\sqrt{19} \\x_{2} =-4-\sqrt{19}

Therefore, the answer is letter C

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Nimfa-mama [501]

Answer:

The real-life distance between the park and the theatre is of 12 km.

Step-by-step explanation:

Scale of 1:400,000

Each means that each centimeter on the map has the real distance of 400,000 cm = 4 km

What is the real-life distance between the park and the theatre?

On the map, the distance between them is of 3 centimeters.

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The real-life distance between the park and the theatre is of 12 km.

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creativ13 [48]

Answer:

f(x)=x(x-5)(x+2)

Step-by-step explanation:

Since the steps of the factorization of the polynomial f(x) is not given, I will proceed to give the correct factorization of f(x).

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The correct factorization of the polynomial f(x)=x³-3x²-10x is: f(x)=x(x-5)(x+2)

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3 years ago
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Answer:

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Step-by-step explanatio

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Step-by-step explanation:

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