the length of the mobile phone is 6cm more than its width. the are of the face is 40cm2. find the length and width

Question

math homework

Answer 1

A = l x w

40 = (w + 6)w

40 = w² + 6w

w² + 6w - 40 = 0

(w + 10)(w - 4) = 0

 

w + 10 = 0

w = -10

We don't measure with negative numbers, so this is out.

 

w - 4 = 0

 w = 4

 

4 + 6 = 10

 

The mobile phone is 10 x 4 cm.