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How do you solve 5x² - 20x² (GCF)

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GCF means?
GCF means Greatest Common Factor.

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Other answers:

Am I right?
@allea_marie reply pls
There needs to be more here, for there to be something to solve.
Yes it stands for Greatest Common Factor
so what are the two numbers that you want to find the greatest common factor of?
But why do you need GCF to solve this? It is quite simple. Just subtract 5-20 and carry over the x^2. That would be -15x^2
Okay thanks, how would you solve 2x² - 21x=54
that one can be solved by factorising the polynomial.
\[ 2x^2 - 21x =54 \] \[2x^2 - 21x - 54 = 0 \] Now you want to solve: \[(2x + a)(x +b) = 2x^2 - 21x - 54 \] Note that you must have \[ a*b = -54 \]
this won't always work so easily. But I can see here that it does.
Okay thank you

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