Question

You are given a piece of cardboard and asked to cut out a square of area (169y2 + 260y + 100) cm2. The side length of the square is ax + b cm, where a and b are whole numbers. Find an expression for the perimeter of the square. Find the perimeter when y = 10 cm.

A.p = 17y + 10; 180 cm
B.p = 68y + 40; 720 cm
C.p = 52y + 40; 560 cm
D.p = 13y + 10; 140 cm

Answer 1

square root of area  = (13y + 10)  cm = length of each side of the square piece.

perimeter is
p = 4(13y + 10)

 =  52y + 40 Answer

when y= 10 p =  560 answer

Option C is the correct one.