Question

Help

Answer 1

http://prntscr.com/8hbgo2

Answer 2

area of rectangle=w*l
given- area=x^2 +40x+300

so

w*l =x^2 +40x +300
\[w*l=x^2 +10x+30x+400\]\[w*l=x(x+10)+30(x+10)\]\[w \times l =(x+10)(x+30)\]comparing u get w=x=10 and l=x+30

Answer 3

http://prntscr.com/8hghyu

Can u plz help with part b as well?

Answer 4

@surjithayer

Answer 5

length=x+30=20+30=50
width=x+10=20+10=30
area=50*30=1500
or just plug x=20 in the given area.

Answer 6

are those my final answers?