Assignment
Active
Analyzing a Method of Factorization
Determine if Ginny factored correctly If not, explain
where she made an error
Ginny factored 6x2 - 31x - 30 as shown
1 ac = -180 and b = 31
2 36(-5) = -180 and 36 + (-5) = 31
36x2 + 36x - 5x - 30
1.6x(x + 6) - 5(x + 6)
5 (x+6)(6x - 5)
Ginny made a mistake in step 1 when she identified
b = 31. It should be b= -31
Ginny was correct until step 3 when she used 36
and -5 as the coefficients of
Ginny was correct until step 4 when she incorrectly
factored the GCF from 5x - 30
Ginny factored the trinomial correctly