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lapo4ka [179]
4 years ago
12

Solve for x: -2x – 9= X – 21

Mathematics
2 answers:
antiseptic1488 [7]4 years ago
7 0

Answer:

x = 10

Step-by-step explanation:

Degger [83]4 years ago
4 0

Answer:

x=4

Step-by-step explanation:

add 2x to both sides

-9=3x-21

add 21 both sides

12=3x

divide each side by 3

4=x

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Alright well solve for f by cross multiplying

Exact form: f = 57/4

Decimal form: f = 14.25 Hope this helps have a nice day :)

Step-by-step explanation:


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3 years ago
Find the volume of each figure. Round to the nearest hundredth if necessary.
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810

Step-by-step explanation:

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Can you help me of this homework?
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4 years ago
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Please help me with the question.
Firdavs [7]

Answer:

  f(\boxed{-5})=\boxed{17}

Step-by-step explanation:

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5 0
4 years ago
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Let a=x^2+4. Use a to find the solutions for the following equation: (x^2+4)^2+32=12x^2+48. Which one of the following are solut
klemol [59]
(x^2+4)^2+32=12x^2+48 \\
(x^2+4)^2+32=12(x^2+4) \ \ \ |-12(x^2+4) \\
(x^2+4)^2-12(x^2+4)+32=0 \\
\hbox{substitute a for } x^2+4: \\
a^2-12a+32=0 \\
a^2-4a-8a+32=0 \\
a(a-4)-8(a-4)=0 \\
(a-8)(a-4)=0 \\
a-8=0 \ \lor \ a-4=0 \\
a=8 \ \lor \ a=4 \\ \\
\hbox{substitute 8 and 4 for a and solve for x:} \\
a=8 \\
\Downarrow \\
8=x^2+4 \ \ \ |-4 \\
4=x^2 \\
x=-2 \ \lor \ x=2 \\ \\
a=4 \\
\Downarrow \\
4=x^2+4 \ \ \ |-4 \\
0=x^2 \\
x=0 \\ \\
\boxed{x=-2 \hbox{ or } x=0 \hbox{ or } x=2}

The solutions for x are -2, 0, 2.
5 0
3 years ago
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