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DochEvi [55]
3 years ago
10

Solve x2 = 12x – 15 by completing the square. Which is the solution set of the equation?

Mathematics
2 answers:
REY [17]3 years ago
8 0
X ·2 = 12x - 15

2x = 12x - 15

2x + (-12x) = (12x - 15) + (-12x)

Result: x = 3/2

serious [3.7K]3 years ago
5 0
The answer to your solution of the equation is 3/2

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X^4-x^2-42=0 <br>need to solve equation and find solution set
Ipatiy [6.2K]
That's a quadratic equation in x^2, which means we get an extra square root and \pm at the end.

x^4 - x^2 - 42 = 0

We factor,

(x^2 - 7)(x^2+6) = 0

x^2 = 7 \quad \textrm{or} \quad x^2 = -6

x = \pm \sqrt{7} \quad \textrm{or} \quad x = \pm i \sqrt{6}
5 0
3 years ago
PLs HeLp Mememememe :((((((((((((((((((((( (
Drupady [299]

Answer:

21/2

Step-by-step explanation:

10.5 is correct, but that's a decimal

21/2=10.5

6 0
2 years ago
Read 2 more answers
18 – 12 + x = 10 What value of x makes the equation true?
drek231 [11]

Answer:

4

explanation:

well 18 minus 12 would equal 6. correct? so we would add x to 6 so the new equation would be 6 + x = 10 or to make it easier just do 10 - x = 6

5 0
3 years ago
Read 2 more answers
the sum of three numbers is 144. the third number is 4 times the first. the second number is 6 more than the first. what are the
Law Incorporation [45]
First I would change the descriptions of the numbers into expressions.

first number is n
second number is n + 6
third number is 4n (4 x n)

Then you would insert these expressions into an equation and isolate n.

n + n + 6 + 4n = 144
n + n + 4n = 144 - 6
6n = 138
n = 138/6
n = 23

Lastly, you would plug in this value into all of the expressions.

first number is 23
second number is 23 + 6 = 29
third number is 4(23) = 92

Therefore, the numbers are 23, 29, and 92.
7 0
3 years ago
What is -2•3x simplified?
Dmitriy789 [7]

Answer:

Multiply  

3  by  − 2 =− 6 x

Step-by-step explanation:

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3 years ago
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