Solve by using middle term spliting y²+y-132
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y²+ y - 132
0 = y² + 12y - 11y - 132
0 = y ( y + 12 ) - 11 ( y + 12 )
0 = ( y - 11 ) ( y + 12)
( y - 11 ) = 0, y = 11
( y + 12 ) = 0, y = - 12
0 = y² + 12y - 11y - 132
0 = y ( y + 12 ) - 11 ( y + 12 )
0 = ( y - 11 ) ( y + 12)
( y - 11 ) = 0, y = 11
( y + 12 ) = 0, y = - 12
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+12 and -11 is the splitting of middle term
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