How do i solve 2x^2+5x+2=9

2x² + 5x + 2 = 9
2x² + 5x + 2 - 9 = 9 - 9
2x² + 5x - 7 = 0
x = -5 +/- √(5² - 4(2)(-7))
                    2(2)
x = -5 +/- √(25 + 56)
                   4
x = -5 +/- √(81)
               4
x = -5 +/- 9
            4
x = -5 + 9      x = -5 - 9
           4                   4
x = 4              x = -14
      4                      4
x = 1              x = -3.5

Calculates the volume, lateral area and surface area of a square pyramid given the base side and height.

base side a

height h

6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digitvolume V

 

lateral area F

 

surface area S

 

slant height b

 

angle of inclination φ

 

degree

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The base and height of the Great Pyramid of Khufu are calculated as default values (230.4m and 146.6m).