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2 + 2(4) + √(2² - 4(2)(4) + 4(4))
= 2 + 8 + √(4 - 32 + 16)
= 10 + √(-12)
maka :
a+2b+√a²-4ab+4b
= 2+2.4+√2²-4.2.4+4.4
= 2+8+√4-32+16
= 2+8+2-32+16
= 10+2-32+16
= 12-32+16
= -20+16
= -4