Question 536598
Check if it can be factored with reverse FOIL.<P>
Can you find factors of -40 that when added = -18?<P>
Factors of -40 are -40 and 1, -20 and 2, -10 and 4, -5 and 8 and the same factor pairs with the signs switched (40 and -1, for example).  Look at -20 and 2.  -20+2 = -18.  Those factors work.<P>
(x-20)(x+2)=0<P>
By the 0 product rule, set each =0 and solve for x.<P>
x-20=0  (Add 20 to both sides.)  x=20<P>
x+2=0  (Subtract 2 from both sides.) x=-2.
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