3 years ago

Is ( square root 12 -4)(4+square root 12) rational or irrational

1 answer:

4 0

Remember
(a-b)(a+b)=a²-b²

we can rewrite what we were given into
$( \sqrt{12}-4)( \sqrt{12}+4)=( \sqrt{12})^2-(4)^2=12-16=-4$
definitely rational

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