A square has a side length equal to 2x - 5 inches. What is the area of this square
Area of square :
A = side²
In this case:
A = ( 2 x - 5 )²
Apply formula:
( a - b )² = a² - 2 a b + b²
A = ( 2 x - 5 )² = ( 2 x )² - 2 ∙ 2 x ∙ 5 + 5²
A = 4 x² - 20 x + 25