Answer:
x = 7, x = -3
Explanation:
We can find the zeros by factoring the equation using the zero product property.
x^2-4x-21 = 0
(x-7)(x+3) = 0
x-7 = 0
x = 7
x+3 = 0
x = -3
Zeros are x=7 and x= -3.
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