trying to find the possible values of x to 2DP, ok so far i have done this

M=wx(1-x)

2

original question but with the values i had given put in

70=1.5x(20-x)

2

70X2=1.5x(20-x)

140=1.5x(20-x)

140=x(20-x)

1.5

93.3=x(20-x)

93.3=20x-x2 (squared)

93.3=x-x2

20

4.665=x-x2

is this right, and where do i go to next?