Question

$if \: x = \frac{ \sqrt{3} + 1 }{2} ,find \: the \: value \: of \: \\ {4x}^{3} + {2x}^{2} - 8x + 7$


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Answer 1

Step-by-step explanation:

Here,

1st i will convert (√3 + 1)/2

= 2.732/2

= 1.366

Than,

4x³ + 2x² -8x + 7

4×( 1.366)³ + 2 x ( 1.366)² - 8 x 1.366 + 7

4 x 2.54 + 2 x 1.86 - 8 x 1.366 + 7

10.16 + 3.72 - 10.928 + 7

20.88 - 10.92

9.96

10 approximately

Answer 2

Step-by-step explanation:

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