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GCF means?

-15x^2

GCF means Greatest Common Factor.

Am I right?

@allea_marie reply pls

Hello?

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?

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

that one can be solved by factorising the polynomial.

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

Okay thank you