Question

X+1/X=4,thenx2+1/x2,solve this​

Answer 1

Answer:

$x + 1 \times x =4 \\ x \times x = 4 - 1 \\ x = 3x \\ \frac{x}{x} = \frac{3x}{x} \\ x = 3(ans)$

${x}^{2} + 1 \times {x}^{2} \\ = {(3)}^{2} + 1 \times {(3)}^{2} \\ = 9 + 1 \times 9 \\ = 10 \times 9 \\ 90(ans)$