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10x^2-90 How is that to be factored?

I am having difficulty solving factoring binomial and certain polynomial problems. 
This one is giving me quite a challenge.

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Brad M. | Professional Tutor: Ultra Streamlined Math - Physics - AccountingProfessional Tutor: Ultra Streamlined M...
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Hey Glenn -- remove the ten ... 10(x*x - 9) ... 10(x+3)(x-3) ... Regards, sir :)