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kupik [55]
3 years ago
9

solve the following quadratic equation by completing the square. if you need to round to the nearest tenth. x² - 20x = -75

Mathematics
1 answer:
lesantik [10]3 years ago
5 0
The Answer should be either x=15 or x=5 I got both.
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Can someone explain?
natita [175]

Explanation:

<u>Statement 2</u>:

  Angle J is congruent to itself

<u>Reason 2</u>:

  Reflexive property of congruence

__

<u>Statement 3</u>:

  ΔHIJ ~ ΔGHJ

<u>Reason 3</u>:

  SAS similarity theorem

_____

The sides given as proportional (having the same ratio) are corresponding sides in the two triangles. The first pair of sides (HJ, GJ) are named by the first and last letters of the triangle names, so correspond. The second pair of sides (IJ, HJ) are named by the last two letters of the triangle names, so correspond.

The angle between these corresponding sides is the one at the vertex whose name is the point shared by the sides. In the first triangle, the two sides of interest are HJ and IJ, which share the point at J. Thus angle J is the angle between these two sides. In the second triangle, the two sides of interest are GJ and HJ, which share the point at J. Hence angle J is the angle between these two sides, also.

So, we have corresponding sides that are proportional and the angle between them that is congruent (to itself). This allows us to invoke the SAS theorem for triangle similarity.

7 0
3 years ago
How much of a radioactive kind of francium will be left after 44 minutes if you start with 2,616 grams and the half-life is 22 m
Katyanochek1 [597]

Step-by-step explanation:

sorry but I dont know

6 0
2 years ago
Read 2 more answers
Reflect the line segment across the x-axis. Then, rotate it 90° clockwise. Finally,
Dmitriy789 [7]
Yes it’s still a line segment. The shape didn’t change in size.
3 0
3 years ago
x years after the year 2015 the population of the city of Fulton is given by the function of F(x)=35000(1.03)^x and the populati
STatiana [176]

Answer:(2) (3) (4)

Step-by-step explanation:

6 0
3 years ago
A cost of a pair of football boots have been decreased from £70 to £52.50, what was the percentage change?
alisha [4.7K]
I think it’s 25%


Because 70 divided by 10 is 7
Which is then 10% so 20% is 14 then 5% is half of 7 which is 3.5
So 70 -7-7-3.5=52.5 which is 25%
4 0
3 years ago
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