Question

1) A square has a side length of 3x. Find the perimeter as an algebraic expression.

2) Expanding brackets : ( x + 2 ) ( x + 4 )
3) Expanding brackets : ( x - 6 ) ( x + 2 )

Answer 1

1) A square has 4 congruent sides, and the perimeter is the sum of these 4 sides. So perimeter = 3x+3x+3x+3x, which can also be expressed by 4(3x), simplified, it equals to 12x.
2) x^2 + 6x + 8
3) x^2 - 4x - 12