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x + y = 39 (pers.1)
x - y = 11 (pers.2)
didapat dri pers.1 , x = 39-y , masukkan ke pers.2
39-y-y = 11
39-2y = 11
39-11 = 2y
28 = 2y
y = 28/2
y = 14
x = 39-y
x = 39-14
x = 25
Jumlah kuadrat = x^2 + y^2 = 25^2 + 14^2 = 625 + 196= 821
#semogamembantu
b - a = 11
b = 11 + a
a + b = 39
a + (11 + a) = 39
a + 11 + a = 39
a + a = 39 - 11
2a = 28
a = 14
a + b = 39
14 + b = 39
b = 39 - 14
b = 25
a² + b² = 14² + 25²
= 196 + 625
= 821