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y = √((y²+2.y.4+4²)-256)
y = √(y²+8y+16-256)
y = √(y²+8y-240)
kedua ruas dikuadratkan, menjadi :
y² = y²+8y-240
y²-y² = 8y-240
0 = 8y-240
0+240 = 8y
240 = 8y
y = 240 : 8
y = 30