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uranmaximum [27]
3 years ago
9

All of the following expressions are equivalent except:

Mathematics
2 answers:
kkurt [141]3 years ago
7 0
A, sub in a random number as x in all equations and solve, eg- x= 3
2-3= -1
3-2=1
-2 +3= 1
3-2=1
alexandr402 [8]3 years ago
6 0

Answer:

  A.  2-x

Step-by-step explanation:

There are a number of ways you can look at this. You can look at the sign of 2, or you can look at the sign of x, or you can rewrite all of the expressions in standard form (decreasing powers of x). In standard form, we have ...

  A: -x +2

  B: x -2

  C: x -2

  D: x -2

Clearly, the different expression is choice A.

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Answer:

You did not post the options, but i will try to answer this in a general way.

Because we have two solutions, i know that we are talking about quadratic equations, of the form of:

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There are two easy ways to see if the solutions of this equation are real or not.

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2) look at the determinant.

The determinant of a quadratic equation is:

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if D > 0, we have two real solutions.

if D = 0, we have one real solution (or two real solutions that are equal)

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Step-by-step explanation:

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