Answer :
Answer:
Step-by-step explanation:
Original area = 20 x 20
a) New area = ( 20-x)(20-x) = ( 20-x)^2 = x^2 -40x+400
b) when x = 5 : 5^2 - 40(5) + 400 = 225 cm^2
Answer:
Step-by-step explanation:
Original area = 20 x 20
a) New area = ( 20-x)(20-x) = ( 20-x)^2 = x^2 -40x+400
b) when x = 5 : 5^2 - 40(5) + 400 = 225 cm^2