Finding the area under a curve with summation notation

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I'll be honest - this problem always gets me. They seem like a simple idea, but then I often make an algebraic mistake.

Here is the area under a curve from x =1 to x =2 for the function f(x) = 3x^2+2
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Perfectly explained. Subbed and liked. Now I understand what is happening

agustingomez
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It's not about saving paper, IT'S ABOUT DOING MATH!

kindoftruth
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14:21 That feeling when I can finally solve a math problem 🤣

rigidkung
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This was really helpful though 👏 thank you!!

kindoftruth
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I still dont get it 😥 (not your fault.)

sparkleyes
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Now I understand what is happening, but please teach out everything don't show us your skills only, don't skip steps

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