Question

how to solve this first question pls help

Answer 1

$x {}^{2} + \frac{1}{x {}^{2} } = (x + \frac{1}{x} ) {}^{2} - 2 \times x \times \frac{1}{x} \\ =( 3) {}^{2} - 2 \: (because \: x + \frac{1}{x} = 3) \\ = 9 - 2 = 7 \\ so \: x {}^{2} + \frac{1}{x {}^{2} } = 7$