Math, asked by dilkushgurjar, 1 month ago

27x³-ax²-x+3 if x=-1/3 find a​

Answers

Answered by atharvarangdale
0

Step-by-step explanation:

1 - a/9 -1/3 +3

-a-3/9 + 4

33-a/9

So a= 33

Answered by ciola
0

Answer:

Let’s \:  \:  assume \\ 27 {x}^{3}  - a {x}^{2}  - x + 3 = 0 \\  \\  If \:  \: x =  \frac{ - 1}{3} \\ 27 {x}^{3}  - a {x}^{2}  - x + 3 = 0  \\ 27 {x}^{3} - a {x}^{2} - x =  - 3  \\ 27 { (\frac{ - 1}{3}) }^{3}  -a { (\frac{ - 1}{3}) }^{2}  -  (\frac{ - 1}{3} ) = - 3 \\ 27 (\frac{ - 1}{27} ) - a( \frac{1}{9} ) -  \frac{ - 1}{3}  =  - 3 \\ ( \cancel{ 27} \times  \frac{ - 1}{ \cancel{27}} ) -  (a \times \frac{1}{9} ) +  \frac{1}{3}  =  - 3 \\  - 1 -  \frac{a}{9}  +  \frac{1}{3}  =  - 3 \\  \frac{ - 9 - a + 3}{9}  =  - 3 \\  - 9 - a + 3 =  - 3 \times 9 \\   - 6 - a =  - 27 \\  - 6 + 27 = a \\ \underline{ \underline{ 21}}= a

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