A.) To find the perimeter, add two lengths and two widths. length= 3x+7 width= 2x-3 3x+7+3x+7+2x-3+2x-3 Combine like terms you end up with an expression like this: 14x+8 cm
B.) Plug in 4 for x into the new expression: 14(4)+8 perimeter=64 cm
C.)When multiplying polynomials, it's just like normal multiplication, except remember to add the exponents. 3x*2x=6x^2 7*-3= -21 So, the new expression is: 6x^2-21 cm squared D.) Again, plug in the 4 for x. 6(4^2)-21 4*4=16 16*6=96 96-21=75 Area=75 cm squared E.) If the length is 5 cm longer: Remember, the length is 3x+7 So, just add 5 to the expression. 7+5=12 The new expression is: 3x+12 Then, add that like you did before. 3x+12+3x+12+2x-3+2x-3 New expression: Perimeter=10x+18 cm
