a+b=4
ab=-6
(a-b)²=a²-2ab+b²=(a+b)² - 2ab - 2ab=(a+b)²- 4ab=4²- 4×(-6)=16+24=40
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a+b=4
ab=-6
(a-b)²=a²-2ab+b²=(a+b)² - 2ab - 2ab=(a+b)²- 4ab=4²- 4×(-6)=16+24=40