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Mathematics 20 Online
OpenStudy (anonymous):

factor the trinomial y^2 -10y+21

OpenStudy (solomonzelman):

no not everythin, the constants are negative, my bad.

OpenStudy (solomonzelman):

(y -7) (y-3) see?

OpenStudy (solomonzelman):

@esmig10, do you understand

OpenStudy (solomonzelman):

factors of 21 21 & 1 7 & 3 (you can put some or all negative or positive.) what combination of those factors add up to -10, and make 21 when you multiply them together?

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