Answer:
-9/7
Step-by-step explanation:
Simplify and remove like terms.
First you must have the quadratic equal to zero. In order to do this you must subtract 7 to both sides
x^2 + 20x + (100 - 7) = 7 - 7
x^2 + 20x + 93 = 0
Now you must find two numbers who's sum equals 20 and their multiplication equal 93
Are there any? NO!
This means that you have to use the formula:
![\frac{-b±\sqrt{b^{2} - 4ac} }{2a}](https://tex.z-dn.net/?f=%5Cfrac%7B-b%C2%B1%5Csqrt%7Bb%5E%7B2%7D%20-%204ac%7D%20%7D%7B2a%7D)
In this case:
a = 1
b = 20
c = 93
![\frac{-(20) plus/minus\sqrt{20^{2} - 4(1)(93)} }{2*1}](https://tex.z-dn.net/?f=%5Cfrac%7B-%2820%29%20plus%2Fminus%5Csqrt%7B20%5E%7B2%7D%20-%204%281%29%2893%29%7D%20%7D%7B2%2A1%7D)
![\frac{-20 plus/minus\sqrt{400 - 372} }{2}](https://tex.z-dn.net/?f=%5Cfrac%7B-20%20plus%2Fminus%5Csqrt%7B400%20-%20372%7D%20%7D%7B2%7D)
![\frac{-20 plus/minus\sqrt{28} }{2}](https://tex.z-dn.net/?f=%5Cfrac%7B-20%20plus%2Fminus%5Csqrt%7B28%7D%20%7D%7B2%7D)
^^^We must simplify √28
√28 = 2√7
so...
![\frac{-20 plus/minus 2\sqrt{7} }{2}](https://tex.z-dn.net/?f=%5Cfrac%7B-20%20plus%2Fminus%202%5Csqrt%7B7%7D%20%7D%7B2%7D)
simplify further:
![-10 plus/minus\sqrt{7](https://tex.z-dn.net/?f=-10%20plus%2Fminus%5Csqrt%7B7)
-10 + √7
or
-10 - √7
***plus/minus = ±
Hope this helped!
~Just a girl in love with Shawn Mendes
the width of a book is about ("25 x 20cm")
the length of a pencil is about 15cm (19cm if unsharpened)
Answer:
sknsonsknsknsknskdnksndksn?