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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. | STEM Specialist plus Business, Accounting, Investment & EditingSTEM Specialist plus Business, Accountin...
4.9 4.9 (231 lesson ratings) (231)
Hey Glenn -- remove the ten ... 10(x*x - 9) ... 10(x+3)(x-3) ... Regards, sir :)