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aksik [14]
3 years ago
15

Does someone knows how to solve this. Step by step? Completing the Square:x^2-6x=15​

Mathematics
1 answer:
bixtya [17]3 years ago
3 0

Answer:

x_1=3+2\sqrt{6}

x_2=3-2\sqrt{6}

Step-by-step explanation

\rule{100mm}{0.5mm}

                           x^2-6x=15

x^2-6x+\left(\dfrac{6}{2}\right)^2-\left(\dfrac{6}{2}\right)^2=15

                   x^2-6x+3^2=15+3^2

                     x^2-6x+9=15+9

                          (x-3)^2=24

                       \sqrt{(x-3)^2} =\sqrt{24}

                              x-3=\pm2\sqrt{6}

                                  \red{\boxed{x_1=3+2\sqrt{6}}}

                                  \red{\boxed{x_2=3-2\sqrt{6}}}                                

\rule {100mm}{0.5mm}

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Im really confused can somebody explain this?
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<u>Given</u>:

The given ratio is 16 : 12

We need to determine three ratios that are equivalent to the given ratio.

<u>Option A</u>: 8:6

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Let us divide the given ratio 16 : 12 by 2.

Thus, we have;

8:6

Hence, the expression 8:6 is equivalent to 16 : 12

Thus, Option A is the correct answer.

<u>Option B</u>: 32:24

The number 32 goes by 16 in 2 times and the number 24 goes by 12 in 2 times.

Thus, multiplying the ratio 16 : 12 by 2, we get;

32:24

Thus, the expression 32:24 is equivalent to 16 : 12

Hence, Option B is the correct answer.

<u>Option C</u>: 4:3

Let us divide the given ratio 16 : 12 by 4.

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Thus, the expression 4:3 is equivalent to 16 : 12

Hence, Option C is the correct answer.

<u>Option D</u>: 12:8

The number 12 goes by 16 in \frac{3}{4} times and the number 8 goes by 12 in \frac{2}{3} times.

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The number 24 goes by 16 in 1.5 times and the number 16 goes by 12 in 0.75 times.

The ratios are multiplied by different numbers.

Thus, the expression 24:16 is not equivalent to 16 : 12

Hence, Option E is not the correct answer.

Therefore, the equivalent ratios are Option A, B and C

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