Question

Tolong jawab beserta caranya no 26

Answer 1

K persegi panjang = 140 cm
2(p + l) = 140 cm
p + l = 140/2
p + l = 70
p = 70 - l

L = p × l
= (70 - l)l
= 70l - l^2

L maksimum, L' = 0 (turunkan persamaan L)
L' = 70 - 2l
0 = 70 - 2l
2l = 70
l = 70/2 = 35 cm

p = 70 - l
= 70 - 35 = 35 cm

L = p × l
= 35 × 35 = 1.225 cm^2 (d)

^ = pangkat

maaf kalau salah
semoga membantu