A.2.A.10.11TN
Answer to Problem 11:
|
P = |
2l + 2w |
= |
32 |
|
|
l + w |
= |
16 |
|
|
w |
= |
16 – l |
|
|
|
|
|
|
|
A |
= |
lw |
|
|
lw |
= |
60 |
|
|
l(16 – l) |
= |
60 |
|
|
16l – l2 |
= |
60 |
|
|
0 |
= |
l2 - 16l + 60 |
|
|
0 |
= |
(l – 10)(l – 6) |
l = 10 and w = 6 or w = 10 and l = 6