Question

if x (5 + x )is equal to 40 then find x ​

Answer 1

Answer:

x(5+x) = 40

x^2 + 5x -40= 0

a = 1 ,b= 5 ,c = -40

x = [ -b +- √b^2-4ac]/2a

= [ - 5 +- √25+160]/2

= [ - 5 +- √185]/2

= [ -5 +- 13.6]/2

= -18.6/2 or 8.6/2

= -9.3 or 4.3