if b² is greater than or equal to ac and ac is greater than or equal to b²then how b²=ac

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Solution

Dear student
$G i v e n; b^{2} \geq a c . . . (1) a n d a c \geq b^{2} \Rightarrow b^{2} \leq a c,,, (2) F r o m (1) a n d (2), w e g e t b^{2} = a c$
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