Question

Sebuah persergi memiliki sisi (x-1)cm & keliling (3x+5)cm. Tentukan luasnya .
Mohon dengan cara ya

Answer 1

Sisi = (x - 1)cm
K = (3x + 5)cm
L = ?
4 × (x - 1) = 3x + 5
4x - 4 = 3x + 5
4x - 3x = 5 + 4
x = 9
sisi = x - 1 = 9 - 1 = 8cm
L = s × s
= 8 × 8
= 64 cm^2

Answer 2

Sisi = x-1
Keliling = 3x+5

Keliling = 4.s
3x+5 =4(x-1)
3x+5 = 4x-4
3x-4x = -4-5
-x= -9
x= 9

Sisi = x-1
9-1 = 8

Luas = s.s
8.8 = 64