13
-) Show that 5+7 is an irrational number.
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Actually your question is wrong.
Step-by-step explanation:
5+7=12
but 12 is a rational number as it can be wrote in the form p/q.
I think you would be asking about 5+√7. Then it is irrational. For proving this you have to prove that root 7 is irrational then we know that any rational number plus an irrational number is always an irrational number.you can prove that root 7 is irrational by the contradiction trick. here is a photo showing that root 3 is irrational number similarly you can prove root 7 is also irrational.
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Plz mark brainliest ❤️❤️❤️
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