Find the exact solution of x.

Mathematics

2 answers:

Yuki888 [10]3 years ago

8 0

Answer:

x = +/- square root of 7

Step-by-step explanation:

$3x^{2} +7=28\\3x^{2} =21\\x^{2} =7\\x=\sqrt{7} and x=-\sqrt{7}$

MA_775_DIABLO [31]3 years ago

4 0

Answer:

the answer is a . hope this helps

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Evaluate -1-3-(-9)+(-5)

babunello [35]

To evaluate this expression, we need to remember that subtracting a negative number is the same as adding a positive number, and that adding a negative number is the same as subtracting a positive number. Using this knowledge, let's begin to simplify the expression below:

-1 - 3 - (-9) + (-5)

Because addition of a negative number is the same as subtraction of a positive number, we can change + (-5) to -5, as shown below:

-1 - 3 - (-9) - 5

Next, because we know that subtracting a negative number is the same as adding a positive number, we can change - (-9) to + 9, as shown below:

-1 - 3 + 9 - 5

Now, we can subtract the first two terms and begin to evaluate our expression:

-4 + 9 - 5

Next, we can add the first two numbers of the expression:

5 - 5

Now, we can subtract our last two numbers, which gives us our answer:

Therefore, your answer is 0.

Hope this helps!