Find the values of y for which the expression f... - WAEC Mathematics 2016 Question
Find the values of y for which the expression (\frac{y^2 - 9y + 18}{y^2 + 4y - 21}) is undefined
A
6, -7
B
3, -6
C
3, -7
D
-3, -7
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Correct Option: C
(\frac{y^2 - 9y + 18}{y^2 + 4y - 21})
Factorize the denominator;
Y2 + 7y - 3y - 21
= y(y + 7) -3 (y + 7)
= (y - 3)(y + 7)
Hence the expression (\frac{y^2 - 9y + 18}{y^2 + 4y - 21}) is undefined
when y2 + 4y - 21 = 0
ie. y = 3 or -7
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