How this exponent expression is reduced

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    Exponent Expression
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Discussion Overview

The discussion revolves around the reduction of an exponent expression with 8 terms to 5 terms. Participants are exploring the algebraic manipulation involved in simplifying the expression, focusing on the steps taken to combine like terms and rewrite components of the expression.

Discussion Character

  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant asks how the expression A is reduced from 8 terms to 5 terms, seeking clarification on the steps involved.
  • Another participant suggests rewriting the term $-10^{22}$ as $-10 \times 10^{21}$ to facilitate simplification.
  • A participant confirms the utility of the hint and demonstrates the calculation for combining $12\times10^{21}$ and $-10^{22}$, resulting in $2\times10^{21}$.
  • Further calculations are presented to show how $-12\times10^{15}$ and $61\times10^{14}$ combine to yield $-59\times10^{14}$, and how $3\times10^{9}$ and $-36\times10^{8}$ combine to give $-60\times10^{7}$.

Areas of Agreement / Disagreement

Participants are engaged in a collaborative exploration of the simplification process, with no explicit disagreements noted. The discussion remains focused on the mathematical steps without reaching a consensus on a final answer.

Contextual Notes

Participants are working through the algebraic manipulations and may have different approaches to combining terms, but specific assumptions or definitions are not fully articulated.

Sabeel
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Initially the expression A has 8 terms. So how is it reduced in the second line to 5 terms?
Could you show me, please?
Thank you.
\begin{align*}
A&=10^{28} -10^{22} +61\times10^{14}+12\times10^{21}-12\times10^{15}+3\times10^{9}-36\times10^{8}+9\times10^{2}\\
&=10^{28} +2\times10^{21}-59\times10^{14}-60\times10^{7}+9\times10^{2}
\end{align*}
 
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Sabeel said:
Initially the expression A has 8 terms. So how is it reduced in the second line to 5 terms?
Could you show me, please?
Thank you.
\begin{align*}
A&=10^{28} -10^{22} +61\times10^{14}+12\times10^{21}-12\times10^{15}+3\times10^{9}-36\times10^{8}+9\times10^{2}\\
&=10^{28} +2\times10^{21}-59\times10^{14}-60\times10^{7}+9\times10^{2}
\end{align*}
Hi Sabeel, and welcome to MHB!

Here's a clue that might get you started. One of the terms in the first line is $-10^{22}$. You could write that as $-10\times 10^{21}$.
 
Opalg said:
Hi Sabeel, and welcome to MHB!

Here's a clue that might get you started. One of the terms in the first line is $-10^{22}$. You could write that as $-10\times 10^{21}$.

Thank you for welcoming me, and thank you for your answer.
Your hint is useful: $12^{21} - 10^{22} = 12^{21} -10\times 10^{21} =(12-10)10^{21}=2\times10^{21}$
I'll struggle with the others and report back.
 
$-12\times10^{15}+61\times10^{14}=-12\times10\times10^{14}=10^{14}(-120+61)=-59\times10^{14}$
$3\times10^{9}-36\times10^{8}=3\times10\times10^{8}-36\times10^{8}=10^8 (30-36)=-6\times10^{8}=-60\times10^{7}$

Your hint was more than useful. Thank you so much.
 

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