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anzhelika [568]
3 years ago
12

If 5 is subtracted from the square of a number ,the result is 4 , find the number.

Mathematics
1 answer:
Levart [38]3 years ago
7 0

Answer:

9 I think

Step-by-step explanation:

I added 5 plus 4 to get 9 but I'm really not sure but I hope i helped!

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Johan found that the equation –2|8 – x| – 6 = –12 had two possible solutions: x = 5 and x = –11. Which explains whether his solu
lutik1710 [3]

Answer:

we have two solution x = 5 and x = 11

but in given problem x = 5 and x = –11

thus, only one of his solution x = 5 is correct

Step-by-step explanation:

Given

–2|8 – x| – 6 = –12

adding 6 both sides

–2|8 – x| – 6 +6= –12 +6

–2|8 – x|  = –6

dividing both side by -2

–2|8 – x| /-2 = –6/-2

=>|8 – x|  = 3

we know that

in modulus function |Y| = -y or y

Thus

|8 – x|  = 3

can be written as

8-x = 3   or          8- x = -3

8-x-3 = 0  or      8-x+3 = 0

5-x = 0     or      11 -x = 0

x = 5       or x = 11

thus, we have two solution x = 5 and x = 11

but in given problem x = 5 and x = –11

thus, only one of his solution x = 5 is correct

8 0
3 years ago
Solve the quadratic equation by completing the square.
cricket20 [7]

x^2+4x-3=0\\(x^2+4x+4) -3-4=0\\(x+2)^2=7\\x+2=\pm\sqrt{7}\\x=-2\pm\sqrt{7}

The appropriate choice is

... D) x = -2 ±√7

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3 years ago
What does (Y) equal?<br><br> 2(5 + y) = 18
Bas_tet [7]

Answer:

y = 4

Step-by-step explanation:

distribute

10 + 2y = 18

minus 10 from both sides

2y = 8

divide by 2

y = 4

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Step-by-step explanation:

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