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5x^2 + 2x - 3
GCF=1
make sure trinomial in descending order, ( ax^2 + bx + c )
get product of a*c 5 * -3 = -15
look for two numbers whose product is ac ( in this case, -15 ) and whose sum is b ( in this case, 2)
5 and -3
rewrite trinomial as: 5x^2+5x-3x-3 5x(x+1) -3(x+1) (x+1)*(5x-3)