Question

The length of a rectangle is 10cm and the width is 6sm. Each side is enlarged by x cm. The enclosed area of the new rectangle is 480 cm. Whats the new dimensions of the ractangle, and how?

Answer 1

(10+x)(6+x)=480

Answer 2

60 + 16x +x^2=480

Answer 3

I got -30 by 14 which is impossible

Answer 4

x^2+16x=420

Answer 5

i used the quadratic formula

Answer 6

x^2+16x-420
(x-14)(x+30)=0
x=14 or -30
it can be negative so x=14

Answer 7

and then 10+14 and 6+14

Answer 8

Yes

Answer 9

Thanks!