What is the fully factored version of 28u^2 - 7 ? ?

Fully factored version is  7(2u+1)(2u-1)=====well, every term is divisible by 7. so let us take 7 out.when we take 7 out, we have to also divide everything inside by 7.    difference of squares factoring:       therefore, we can fit  with a² - b² because that's a difference of squares.     

A)26•2=52there are 2 sides with the same length116-52=64the other 2 side have to be half of 64 each64/2=32the width is 32b)make two sentences about these steps because your teacher knows how you write and explain things.