Question

(ii) Use the quadratic formula to solve 4x2 +11x-300 = 0.
Show all your working and give your answers correct to 2 decimal
places.
... or x =
[4]
mm​

Answer 1

x=-b+-sqrt (b^2-4ac)/2a
x=-11+-sqrt (11^2-4(8)(-300)/16
x=-11+-sqrt (121+9600)/16
x=-11+-sqrt (9721)/16
x=-11+-98.6/16
x=5.48 or x=-6.85