The figure below shows a triangular wooden frame ABC. The side AD of the frame has rotted and needs to be replaced: What is the length of the wood that is needed to replace AD?

step-by-step explanation:

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis:

this is a good question! i'll do some research and come back when i have the answer!