taylor swift
19/03/2017 at 15:07-
Dung Trần Thùy 19/03/2017 at 22:29The area of the square is S2.
The area of the rectangle is \((S+3)(S-3)=S^2 - 9\)
So, the sum of the areas of 2 fingures is \(S^2+\left(S^2-9\right)=2S^2-9\).
taylor swift selected this answer. -
FA KAKALOTS 06/02/2018 at 12:37The area of the square is S2.
The area of the rectangle is (S+3)(S−3)=S2−9
So, the sum of the areas of 2 fingures is S2+(S2−9)=2S2−9
.