6, -7
3, -6
3, -7
-3, -7
Correct answer is C
y2−9y+18y2+4y−21
Factorize the denominator;
Y2 + 7y - 3y - 21
= y(y + 7) -3 (y + 7)
= (y - 3)(y + 7)
Hence the expression y2−9y+18y2+4y−21 is undefined
when y2 + 4y - 21 = 0
ie. y = 3 or -7
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