<PRE><B>Question 60354</B>
Factor complete:

a. x^2-3x-10
(x__)(x__)  
The blanks need to have integers that multiply to give you -10, and add to give you -3.  -5*2=-10 and -5+2=-3
(x-5)(x+2)

b. 4z^4 + 12z^3 - 40z^2  Factor out the GCF 4z^2
4z^2(z^2+3z-10)
4z^2(z__)(z__)  
The blanks need to be filled with numbers that multiply to give you -10, but add to give you 3.  5*-2=-10 5+-2=3
4z^2(z+5)(z-2)
:
Happy Calculating!!!
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