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L = 2.(pl + pt + lt )
592cm = 2 ( 12.8 + 12.t + 8.t )
20t = 592 - 96 = 295 - 96 = 199
2
20t = 199
t = 199 : 20
t = 9,95cm
No.11
x^{2} + 8x - 153 = 0
x^{2} + 8x + ( setengah dikali 8 )^= 153 + ( setengah dikali 8 )^
x kuadrat + (4)kuadrat = 153 + (4)kuadrat
(x + 4) kuadrat = ± 153 + 16
(x + 4 ) kuadrat = ± √169
x + 4 = ± 13
x = ± 13 - 4
X1 = 13 - 4 = 9
X2 = -13 - 4 = - 17