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AURORKA [14]
2 years ago
13

Which value in the set [4, 9, 15, 36] is a solution of 12 = 3 + x?

Mathematics
2 answers:
Mazyrski [523]2 years ago
8 0
x=9 because 9+3=12 so the answer is 9
Travka [436]2 years ago
4 0

Answer:

x=9

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

12=x+3

Step 2: Flip the equation.

x+3=12

Step 3: Subtract 3 from both sides.

x+3−3=12−3

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Which choices are solutions to the following equations x^2+8x-2=18
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Answer:

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Step-by-step explanation:

Rewritten in standard quadratic form, x^2+8x-2=18 becomes x^2 + 8x - 20 = 0.

Here the quadratic coefficients are a = 1, b = 8 and c = -20 and so the discriminant is b^2 - 4ac, or 8^2 - 4(1)(-20), or 96.

Because the discriminant is positive, we know that this quadratic has two different real roots.  These roots are:

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x = -------------------------

                 2a

which in this case comes out to:

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x = ------------------ = ------------------- = -4 ± 2√6

             2                        2

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