



 
Hi Bill, With w(w + 7) = 170 the next step should be to expand the left side. Using the dissimulative law
Hence you have
Next subtract 170 from each side
The task now is to factor w^{2} + 7w  170, that is to find numbers a and b so that
Notice that if you expand the right side you get
Hence to have
you want numbers a and b so that ab = 170 (so one is positive and one is negative) and a + b = 7. Can you find a and b and complete the problem? If you need further assistance write back,  


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