Question

Q8 Simplify: (65.25 ÷ 15) x 3.8​

Answer 1

Answer:

please mark as brainlist

Step-by-step explanation:

You’ll find that 81+16−−−−−−√=9.84 . That clearly doesn’t equal 13. I just answered your question with a counterexample.

I’ll explain why and how. Remember PEMDAS(or whatever you were taught). And my algebra 1 teacher always said to me “use parentheses. They’re the only thing in life that are free”. Well here, just put in parentheses around 81+16 . Then you have to add them first. Here’s why: take a2+b2−−−−−−√=a+b . We square everything to get rid of the radical, and we get a2+b2=a2+2ab+b2 (visit my answer to see why). Which we know isn’t true, because we combine/cancel like terms and find 2ab=0 . That’s true in some cases, but not all.

Just remember that you cannot simplify that way.