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3 years ago

Follow the process of completing the square to solve 2x2 + 8x - 12 = 0.

Mathematics

1 answer:

ivanzaharov [21]3 years ago

8 0

Answer:

constant = -12

Step-by-step explanation:

Let the given equation be

2x² + 8x - 12 = 0 --------(1)

Here B² =(2√2)^2 = 8

Add 8 in both sides of (1)

Step1 : 2x² + 8x + 4 = 12 + 4

Step 2: x² + 4x + 4 = 16

step 3 : x² + 4x + 4 - 16 = 0

Step 4: x² + 4x - 12 = 0 ---(4)

From the (4) we get constant = -12

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3 years ago

What’s the value of 27.43? Write answer in a fraction

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Answer:

As an improper fraction: 27 $\frac{43}{100}$

As a mixed fraction: $\frac{2743}{100}$

Step-by-step explanation:

Any number could be expressed as a fraction 27 is $\frac{27}{1}$ and since 0.43 is forty-three hundredths we can express it as $\frac{43}{100}$ .

To find the answer as a mixed fraction we have to put the whole number in the beginning and the fraction in the end. 27 $\frac{43}{100}$

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Positive fractions less than 1,with interval of 1/8 between each pair of fractions

Sati [7]

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3 years ago

2x + y - z = -8

Andreyy89

Answer:

Multiply row 1 by $\frac{1}{2}$ .

Step-by-step explanation:

The augmented matrix of the system of linear equation is described below:

$\left[\begin{array}{cccc}2&1&-1&-8\\0&2&3&-6\\-\frac{1}{2} &1&1&-4\end{array}\right]$

Where $a_{11} = 2$ , if we need to create $a_{11} = 1$ , we need to multiply row 1 by $\frac{1}{2}$ , that is to say:

$\left[\begin{array}{cccc}1&\frac{1}{2} &-\frac{1}{2} &-4\\0&2&3&-6\\-\frac{1}{2} &1&1&-4\end{array}\right]$

Hence, the correct answer is: Multiply row 1 by $\frac{1}{2}$ .

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3 years ago