x^2+3x-40/x^2+3x-28

list all numbers for which x^2+3x-40/x^2+3x-28 is not defined
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1 Answer

(x^2 +3x -40) / (x^2 +3x -28)

=1 -12/(x^2 +3x -28)

tu get zeroes, tri quadratik formula

(x-4)*(x+7)

zeroes wen x=4 or -7...kant divide bi 0
by

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