Question

Diketahui panjang = x+3
lebar=x-2
Luas = 50

ukuran persegi panjang(p & l)?
keliling persegi panjang?

Answer 1

P x l = Luas
(x+3)(x-2) = 50
x^2 +x - 6 - 50 = 0
x^2 + x - 56 = 0
(x +8 )(x - 7)= 0
x = - 8  ( tm) krn < 0 
atau x = 7
p = x+3 = 7+3 = 10
l = x-2 = 7-2 = 5
K= =2(p+l) = 2(10+5) = 30