Question 1172177
Hi there,
Making x the positive number
x^2 - 3 + 2x = 0
Rearrange
x^2 - (2x - 3) = 0
x^2 - 2x + 3 = 0
Factorise
(x + 1)(x - 3) = 0 
x + 1 = 0
x = -1
x - 3 = 0
x = 3 (Disregard as negative)
x = 3 is the answer.
Hope this helps :-)