If a + b= 7 and ab = 12, find the value of a + b
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Answer:
a+b=7 ; a²+b²=25
Step-by-step explanation:
(a+b)²=a²+b²+2ab
a²+b² = (a+b)²-2ab
a²+b²=7²-2×12
a²+b²=49-24
a²+b²=25
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