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Oksi-84 [34.3K]
2 years ago
6

HELPPPPPPP on this question.! I need to pass.

Mathematics
1 answer:
timurjin [86]2 years ago
3 0

9514 1404 393

Answer:

  12.25 (or -18.75)

Step-by-step explanation:

If you pay attention to the square of a binomial, ...

  (x -a)² = x² -2ax +a²

You see that the constant (a²) is the square of half the x-coefficient. That is, the x-coefficient is -2a, half that is -a, and the square of that is (-a)² = a².

In your equation, the x-coefficient is -7, half that is -3.5, and the square of that is 3.5² = 12.25.

So, you can think of this ambiguous question in a couple of ways.

<u>Concern is only with the x-terms</u>:

  x² -7x +31 = (x² -7x +12.25) +31 = 12.25 . . . . . . add 12.25 to both sides

  (x -3.5)² +31 = 12.25 . . . . write the x-terms as a square

<u>Concern with the equation overall</u>:

You want the end result to have the x-terms in the form of the square ...

  (x -3.5)² = x -7x +12.25

The left side of the equation can be put in that form by adding -18.75 to both sides;

  x² -7x +31 -18.75 = -18.75 . . . . . . add -18.75 to both sides

  x² -7x +12.25 = -18.75 . . . . . . . . . simplify

  (x -3.5)² = -18.75 . . . . . . write the left side as a square

__

The short of it is that we're not sure what the question is asking for exactly. The "help video" would probably clarify the intent. Most likely, you're concerned with adding the square of half the x-coefficient, 12.25.

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An angle measures 10 more than four times a number. It’s supplement is two more than three times the number. What is the measure
kiruha [24]

Answer:

4x +10 + 3x +2 = 180 (since they're supplementary, the angles together =180)

7x +12 =180  (combine like terms on left side, and subtract 12 from both sides)

7x = 168 (divide both sides by 7 to isolate x)

x= 24

angle 1 = 4(24)+10 (plug x into the expression for each angle, and solve)

..................96 +10

angle 1 = 106 degrees (the measure of the first angle)

angle 2 = 3(24) +2

..................72 +2

angle 2 = 74 (the measure of the second angle)

106 +74 =180 (the two add up to 180, so they're supplementary)

Step-by-step explanation:

I hope this helps :)

6 0
2 years ago
Just in case some of you have this question
Anna007 [38]
This actually helped me
7 0
2 years ago
Read 2 more answers
PLEASE HELP ASAP 5TH GRADE
Natalka [10]

Answer:

Your answer is C.

Step-by-step explanation:

take 2/5 x 240 = 96 which is two fifths of 240

Hope this helps. :)

Have a good day!

4 0
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A family is preparing backpacks filled with school supplies to donate to children in need. They have 14 pencils and 8 notebooks.
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Answer:

2

Step-by-step explanation:

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second one

Step-by-step explanation:

Notice that there's a y intercept of 2 and an x intercept of -4

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