allea_marie
How do you solve 5x²  20x² (GCF)



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AravindG
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GCF means?

AravindG
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15x^2

CheetahBooks1
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GCF means Greatest Common Factor.

CheetahBooks1
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Am I right?

AravindG
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@allea_marie reply pls

CheetahBooks1
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Hello?

scarydoor
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There needs to be more here, for there to be something to solve.

allea_marie
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Yes it stands for Greatest Common Factor

scarydoor
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so what are the two numbers that you want to find the greatest common factor of?

CheetahBooks1
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But why do you need GCF to solve this? It is quite simple. Just subtract 520 and carry over the x^2. That would be 15x^2

allea_marie
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Okay thanks, how would you solve 2x²  21x=54

scarydoor
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that one can be solved by factorising the polynomial.

scarydoor
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\[ 2x^2  21x =54 \]
\[2x^2  21x  54 = 0 \]
Now you want to solve:
\[(2x + a)(x +b) = 2x^2  21x  54 \]
Note that you must have \[ a*b = 54 \]

scarydoor
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this won't always work so easily. But I can see here that it does.

allea_marie
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Okay thank you