Question

Sebuah persegi panjang berukuran panjang(5x- 3) cm dan lbar(x+9).jika keliling persegi panjang 96cm maka luas persegipanjang adlh

Answer 1

Kell = 2(p+l)
96. = 2(5x-3+x+9)
96. = 2(6x+6)
96. = 12x + 12
96-12= 12x
84 = 12x
7. = x

luas PP = p x l
= (5x - 3) . (x+9)
= (5.7-3) . (7+9)
= 32 . 16
= 512 cm2

Answer 2

K = 2p + 2l = 2(5x-3)cm + 2(x+9)cm = (10x-6)cm + (2x+18)cm
96 cm = 12x +12
12x = 84 cm
x = 7 cm

L = panjang x lebar
= (5x-3)cm x (x+9)cm
= (5.7-3)cm x (7+9)cm
=32 cm x 16 cm = 512 cm²