SOLUTION: the answer is 9.8 and 1.2 how did it happen? a^2-11a=12=o =11-sqrt73/2 or 11+sprt73/2 ????????????? sqrt 73 is not an integer Thank you

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: the answer is 9.8 and 1.2 how did it happen? a^2-11a=12=o =11-sqrt73/2 or 11+sprt73/2 ????????????? sqrt 73 is not an integer Thank you      Log On


   

Question 47097: the answer is 9.8 and 1.2 how did it happen?
a^2-11a=12=o
=11-sqrt73/2 or 11+sprt73/2 ????????????? sqrt 73 is not an integer
Thank you
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Solve:
a%5E2-11a%2B12+=+0 Using the quadratic formula:x+=+%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F2a
a+=+%28-%28-11%29%2B-sqrt%28%28-11%29%5E2-4%281%29%2812%29%29%29%2F2%281%29
a+=+%2811%2B-sqrt%28121-48%29%29%2F2
a+=+%2811%2B-sqrt%2873%29%29%2F2
a+=+%2811%2F2%29%2B%28sqrt%2873%29%29%2F2 or a+=+%2811%2F2%29-%28sqrt%2873%29%29%2F2
a+=+5.5%2B4.27 or a+=+5.5-4.27
a = 9.8 or a = 1.2 Rounded to the nearest tenth.