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Tems11 [23]
3 years ago
12

If using the method of completing the square to solve the quadratic equation x^2+15x+21=0, which number would have to be added t

o "complete the square"?
Mathematics
2 answers:
Anit [1.1K]3 years ago
8 0

Step-by-step explanation:

the answer is in the above image

Anna35 [415]3 years ago
3 0

Answer:

my answer is 225/5 sorry comments for wrong

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Please Help!! :D<br><br> Find the value of y.
rjkz [21]

Answer:

y=2\sqrt{2}

Step-by-step explanation:

The Pythagorean theorem is a theorem that can be applied to the sides of a right triangle. Please note that a right angle refers to an angle with a measure of (90) degrees. A box around an angle shows that the angle is a right angle, or has a measure of (90) degrees. The Pythagorean theorem states the following,

a^2+b^2=c^2

Where (a) and (b) are the legs of the triangle, or the side adjacent to the right angle in the right triangle. (c) is the side opposite the right angle, or the hypotenuse of the triangle. One can apply this theorem to the smallest triangle in the diagram to find (y),

a^2+b^2=c^2

Substitute,

(1)^2+(y)^2=(3)^2

Simplify,

(1)^2+(y)^2=(3)^2

1+y^2=9

Inverse operations,

1+y^2=9

y^2=8

y=\sqrt{8}

Take a factor from out of the square root. Remember that a number times itself under the radical is equal to the number. This can be simply stated as the following: (\sqrt{a*a}=a),

y=\sqrt{8}

8=2*2*2

y=\sqrt{8}

y=\sqrt{2*2*2}

y=2\sqrt{2}

4 0
3 years ago
6) Double a number is equal to the number decreased by five. Find the number.
Lemur [1.5K]

Answer:

B) -5

Step-by-step explanation:

let the number be x

2x=x-5

take x to the other side

2x-x=-5

×=-5

4 0
3 years ago
HELP PLS<br> idk how to do this<br> It's called Project: Let's get cooking!
Anastaziya [24]

Answer: What exactly do you need help with

4 0
3 years ago
Brainliest question please help please help me solve all the two problems please
alexgriva [62]

Answer:

(-1,5)

Step-by-step explanation:

up the x corridor and down the y axis.

4 0
3 years ago
Is a exponent determined by the amount of zeros in the number?
Alex777 [14]
Yup, the amount of 0's is the exponent. for example 1000= 10^3, hope this helped :)
3 0
3 years ago
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