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Tamiku [17]
3 years ago
9

Please anwer what is X and give the explantion,how did you get the answer.ASAP

Mathematics
2 answers:
Katena32 [7]3 years ago
8 0
Nfjdjdbdndndnd fbdiwndixkansixjendidnend
grigory [225]3 years ago
7 0

We can solve x through simple algebra.

x + 5 = 2

x = 2 - 5

x = -3

x - 10 = 22

x = 22 + 10

x = 12

x - 27 = 8 + 10

x - 27 = 18

x = 18 + 27

x = 45

-11 + x + (-48) = 25

-11 + (-48) + x = 25

-59 + x = 25

x = 25 + 59

x = 84

x - (-16) = 12 + 13

x + 16 = 25

x = 25 - 16

x = 9

Tip: As you can see, the number sign changes as they shift from left to right (ex. -59 to +59).

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\huge\boxed{\left\{-\dfrac{5+\sqrt{21}}{2};\ \dfrac{-5+\sqrt{21}}{2}\right\}}

Step-by-step explanation:

x^2+5x+1=0\\\\\text{Use the quadratic formula:}\\\\\text{For}\ ax^2+bx+c=0\\\\\Delta=b^2-4ac\\\\\text{if}\ \Delta < 0,\ \text{then the equation has no real solution}\\\text{if}\ \Delta=0,\ \text{then the equation has one real solution}\ x=\dfrac{-b}{2a}\\\text{if}\ \Delta>0,\ \text{then the equation has two real solution}\ x=\dfrac{-b\pm\sqrt{\Delta}}{2a}

\text{We have}\\\\a=1,\ b=5,\ c=1\\\\\Delta=5^2-4(1)(1)=25-4=21>0\\\\x=\dfrac{-5\pm\sqrt{21}}{2(1)}=\dfrac{-5\pm\sqrt{21}}{2}

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