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b. 2x + 2y = 60
x kali y = 22
b. x² - 30x + 22
Penjelasan:
Luas = p . l
22 = p . x
p = 22/x ... (1)
Kll = 2 (p + l)
60 = 2 (p + x)
p + x = 30 ... (2)
22/x + x = 30
(22 + x²) : x = 30
22 + x² = 30x
x² - 30x + 22 = 0