Question

please solve with complete steps

Answer 1

Heya!!
Here is your answer in the picture.



Hope it helps you.

Answer 2

=> 4x³+ 2x² - 8x + 7

=> 2x²(2x+1) - 8x + 7
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$= > x = \frac{ \sqrt{3} + 1 }{2}$
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$= > 2 {x}^{2} (2x + 1) - 8x + 7 \\ \\ = > 2 {( \frac{ \sqrt{3} + 1 }{2}) }^{2} (2 \times \frac{ \sqrt{3} + 1 }{2} + 1) - 8 \times \frac{ \sqrt{3} + 1 }{2} +7\\ \\ = > \frac{3 + 1 + 2 \sqrt{3} }{2} \times ( \sqrt{3} + 2) - 4 \sqrt{3} - 4 +7\\ \\ = > (2 + \sqrt{3} )(2 + \sqrt{3} ) - 4 \sqrt{3} - 4 +7\\ \\ = > 4 + 3 + 4 \sqrt{3} - 4 \sqrt{3 } - 4+7 \\ \\ = > 3 +7=10$
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