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Allushta [10]
3 years ago
9

X^2-8x=-15 solve by completing the square

Mathematics
1 answer:
larisa86 [58]3 years ago
7 0

Answer:

Step-by-step explanation:

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A square is a quadrilateral always sometimes never
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A quadrilateral is a shape with 4 sides, regardless of their lengths, angles, or symmetry. 

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3 years ago
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What the answer to this equation be?
scoray [572]

If you expand the square, you have

\dfrac{1}{4}x^2-3x=7x+8-10x

Simplify the right hand side:

\dfrac{1}{4}x^2-3x=-3x+8

Cancel the -3x appearing on both sides:

\dfrac{1}{4}x^2=8

Multiply both sides by 4:

x^2=32

Consider the square root of both terms (using the doubles sign):

x=\pm\sqrt{32}=\pm4\sqrt{2}

5 0
3 years ago
Guys help me with a) and b) tasks<br>ANSWER:<br>a) 40<br>b) 25<br>Thanks&lt;3​
umka21 [38]

Step-by-step explanation:

there are 2 similar triangles : ABE and DCE

that means they have the same angles, and the scaling factor from one triangle to the other is the same for every side.

and that means that

DE/AE = EC/BE (= DC/AB)

we know that

AE = AD + DE

BE = BC + EC

a.

so, we have actually

DE/(AD+DE) = EC/(BC+EC)

DE/(10+DE) = 8/(2+8) = 8/10 = 4/5

DE = 4(10+DE)/5

5DE = 4(10+DE) = 40 + 4DE

DE = 40 cm

b.

AD/DE = 3/5

BC/EC must be 3/5 too.

15/EC = 3/5

15 = 3EC/5

75 = 3EC

EC = 25 cm

8 0
1 year ago
Find the balance in the account after the given period. ​$2000 principal earning 6​% compounded​ annually, for 8 years. The bala
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Do 2000 divided by 8 than divided that by 6%
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3 years ago
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A book store is having a 30% off sale. Diary of a wimpy kid books are now $6.30 each. What was the original price of the books?
inn [45]
6.30x0.3= 1.89

6.30+1.89=8.19
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3 years ago
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