Show that x 2 +4x+7 has no zero.
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2+4x+7
4x = (-7)-2
= -9
x = -9/4
= -2.25
Therefore 2+4x+7 has no zero
4x = (-7)-2
= -9
x = -9/4
= -2.25
Therefore 2+4x+7 has no zero
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