Question

The area of a rectangle is 70cm^2 if its dimensions are incresed by 2cm its perimeter becomes 42 cm

Answer 1

Answer:

Demantions of rectangle are 7 and 10

Step-by-step explanation:

lw = 70

2( l + 2 + w + 2) = 42 ==> ( l + w) +4 = 21 ==> l = 17 - w

(17 - w)w = 70

- w² + 17w - 70 = 0

w² - 17w + 70 = 0

$w_{1}$ = 10 , $w_{2}$ = 7