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Verified answer
a×b=240
a=8+b
(8+b)×b=240
8b+b^2-240=0
b = (-8 +- √64+960)÷2
b1 = (-8+32)÷2 = 12
b2 = -40÷2 = -20
a-12=8
a=20 (✔memenuhi)
a+20=8
a=-12 (❌tdk memenuhi)
jadi jawaban yang benar adalah 20