Answer:
2A/h-b2 = b1 h ≠0
Explanation:
A = 1/2 (b1+b2)*h
Multiply each side by 2
2A = 2 *1/2 (b1+b2)*h
2A = (b1+b2)*h
Divide each side by h h cannot equal 0
2A /h = (b1+b2)*h/h
2A/h = b1+b2
Subtract b2 from each side
2A/h-b2 = b1+b2 -b2
2A/h-b2 = b1 h ≠0