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2ab + a² = 24
2ab = 24 - a²
V = a²b = 20
b = 20/a²
wracamy:
2ab = 24 - a²
2a * 20/a² = 24 - a²
40/a = 24 - a²
40 = 24a - a³
a³ - 24a + 40 = 0
a = 2
b = 20/4 = 5
V = 20
P = 4ab + 2a² = 48
2ab + a² = 24
2ab = 24 - a²
V = a²b = 20
b = 20/a²
2ab = 24 - a²
2a * 20/a² = 24 - a²
40/a = 24 - a²
40 = 24a - a³
a³ - 24a + 40 = 0
a = 2
b = 20/2²
b=20/4
b=5