Question

The area of the triangle is 56 m2. Find the length of the base.

Answer 1

 you need to know the formula to find out area first.

Area = (1/2)* base*height


So, when you let base as x m then, definitely height becomes (x+6)m.
 
So substitute the values in above formula and you'll get the answer.
I think 56=1/2(x)(x+6)