Question 856397
height = x
base = 2x-2

Area of triangle = 1/2 * base * height

56 = 1/2 * x * 2(x-1)

56=x(x-1)

56=x^2-x

x^2-x-56=0

x^2-8x+7x-56=0

x(x-8)+7(x-8)=0

(x-8)(x+7)=0

take positive value.
x= 8

height = 8 m
base = 2x-2 = 14 m