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Mathematics 22 Online
OpenStudy (anonymous):

factor 5x^2-21x-20

OpenStudy (cwrw238):

(5x )( x ) -5 and + 4 go into the spaces in each bracket - can you see where?

OpenStudy (cwrw238):

the 5 multiples -5 to give -25 and 4 multiplis 1 to give +4 -25 + 4 = -21

OpenStudy (cwrw238):

its (5x + 4)(x - 5 )|dw:1339878773455:dw|

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