Question

(a)If the area is 3x cm square ,make a equation and find x
(b)If the perimeter is 40 cm ,make a equation ,and find x​

Answer 1

Answer:

(a) x= 8

(b) x= 17

Step-by-step explanation:

(a) area = lb

3x = 8 (x-5)

3x = 8x - 40

8x - 3x = 40

5x = 40

x = 8

(b) perimeter = 2(l+b)

40 = 2 (x-5+8)

20 = x + 3

20 - 3 = x

x= 17