Question 150932
How do you factor by grouping, 48x^2y + 20xz +12xy + 5z, 
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Rearrange like this:
48x^2y + 12xy + 20xz + 5z
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It's now apparent that we can factor 12xy and 5z like this;
12xy(4x + 1) + 5z(4x + 1)
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Factor out (4x+1) and we have:
(4x + 1)(12xy + 5z)