(4y - 1)(y + 2)
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Step 1: 3(7y2 + 24y - 16) Step 2: 3(7y - 4)(y + 4) Assuming original expression was equal to zero, y = 4/7 or -4
(7y - 5)(y + 1)
That factors to y(y2 + 7y - 5)
Zero. There is no term with just y in it.
By following the directions in your textbook. Or you could try paying attention in class; that would probably work too.