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Vadim26 [7]
3 years ago
6

-x+10=5x-12 the answer

Mathematics
2 answers:
ioda3 years ago
7 0
<span>-x+10=5x-12 So first you need to put the x's on one side. You have to transfer 5x. So it will be -5x - x. When you transfer the 5, you change the sign. So if it was -3, it would be 3 when you move it. Now you move the 10. It has a plus infront of it so it will be negative. So now you have -5x -x=-10 -12. -10-12=-22. -5x-x=-6x. So you have -6x=-22. Now you have to rid of the 6. 6x is the same as 6 times x, so you use division. So you have x=22/6. (Since you have two negative numbers you can cross them out) and you can now simplify. Your answer would be... 3 2/3!</span>
ehidna [41]3 years ago
5 0
-x+10=5x-12\\&#10;6x=22\\&#10;x=\frac{22}{6}=\frac{11}{3}
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All three please 10 points
GaryK [48]

Answer:

A) x = 3 or -1

B) x = -7

C)x = -7

Step-by-step explanation:

A) x² + 2x + 1 = 2x² - 2

Rearranging, we have;

2x² - x² - 2x - 2 - 1 = 0

x² - 2x - 3 = 0

Using quadratic formula, we have;

x = [-(-2) ± √((-2)² - 4(1 × -3))]/(2 × 1)

x = (2 ± √16)/2

x = (2 + 4)/2 or (2 - 4)/2

x = 6/2 or -2/2

x = 3 or -1

B) ((x + 2)/3) - 2/15 = (x - 2)/5

Multiply through by 15 to get;

5(x + 2) - 2 = 3(x - 2)

5x + 10 - 2 = 3x - 6

5x - 3x = -6 - 10 + 2

2x = -14

x = -14/2

x = -7

C) log(2x + 3) = 2log x

From log derivations, 2 log x is same as log x²

Thus;

log(2x + 3) = logx²

Log will cancel out to give;

2x + 3 = x²

x² - 2x - 3 = 0

Using quadratic formula, we have;

x = [-(-2) ± √((-2)² - 4(1 × -3))]/(2 × 1)

x = (2 ± √16)/2

x = (2 + 4)/2 or (2 - 4)/2

x = 6/2 or -2/2

x = 3 or -1

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Answer:

no dosifica

Step-by-step explanation:

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Step-by-step explanation:

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