已知(a+b)²=17,ab=3.求(a-b)²的值

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已知(a+b)²=17,ab=3.求(a-b)²的值
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已知(a+b)²=17,ab=3.求(a-b)²的值
已知(a+b)²=17,ab=3.求(a-b)²的值

已知(a+b)²=17,ab=3.求(a-b)²的值

(a-b)²
=(a+b)²-4ab
=17-4×3
=17-12
=5