Question

7 P - 14 p² + 21 P³​

Answer 1

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7p - 14p^2+21p^3 = 0

7p( 1 -2p+3p^2) = 0

3p^2-2p+1 = 0

$3p ^{2} - 3p + p + 1 = 0 \\ 3p(p + 1) + 1(p + 1) = 0$

(3p + 1 ) ( p+1) = 0

$p = - 1 </em><em>/</em><em>3</em><em> \\ - - - - - or - - - - - \\ p = - 1$

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