emathematics.net
Español
User: desconectar
 
Maths Exercices

Add polynomials to find perimeter


Find the perimeter of the following rectangle.

To find the perimeter, add the lengths of the four sides:

P = (3x+2)+(x+4)+(3x+2)+(x+4) Set it up!
= (3x+x+3x+x)*(2+4+2+4) Regroup
= 8x+12 Combine like terms

Find the perimeter of the following rectangle by using the formula P=2L+2W, where L represents the legth and W represents the width of the rectangle.


To find the perimeter, let L=2x+3 (the legth) and W=x+1 (the width) and plug these values into the formula P=2L+2W.

P = 2(2x+3)+2(x+1) Substitute for L and W
= 4x+6+2x+2 Use the distributive property
= (4x+2x)+(6+2)   Regroup
  = 6x+8 Combine like terms