Question 579130
height =x
base = (x-1)

Area = 1/2 * bases * height

15 = 1/2 * x(x-1)
multiply by 2
30 = x(x-1)
30= x^2-x

x^2-x-30=0

x^2-6x+5x-30=0

x(x-6)+5(x-6)=0
(x-6)(x+5)=0

x=6 OR -5

ignore the negative
height = 6 m
base = 5 m