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inessss [21]
3 years ago
11

Solve for x 21=3(2x-10)+9​

Mathematics
2 answers:
alekssr [168]3 years ago
6 0

Answer:

The answer is : 7

Step-by-step explanation:

21=3(2x-10)+9​

21 = 6x - 30 + 9

21 = 6x - 21

6x = 21 + 21

6x = 42

x = 42/6

x = 7

qwelly [4]3 years ago
4 0

Answer:

x=7

Step-by-step explanation:

21=3(2x - 10) +9

21=6x -30 +9

21= 6x -21

6x=42

x=7

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3 years ago
What is the equation in vertex form of the quadratic function with a vertex at (-1, -4) that goes through (1, 8)?
cestrela7 [59]

Answer:

y = 3(x+1)^2 - 4

Step-by-step explanation:The general form of the equation of a quadratic function whose vertex is (h,k) and whose leading coefficient is a is:

y - k = a(x-h)^2, or

y      = a(x-h)^2 - k

Substituting the coefficients of the vertex (-1, -4), we get:

y      = a(x + 1)^2 - 4

Substituting the coordinates of the given point, (1,8), we get:

8      = a(1+1)^2 - 4, which simplifies to:

8      = a(2)^2 - 4, or

8  = 4a - 4.  Then 4a = 12, and a = 3.

Thus, the desired equation is y = 3(x+1)^2 - 4 (answer j).


5 0
4 years ago
A line passes through the points (0, -2) and (0, 5). Is it possible to write an equation of the line in slope-intercept form? ju
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</span>To see why that happens we need to solve for x:
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Answer: i dont know how to solve 3D triangle shapes

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