Step-by-step explanation:
[tex] \implies \sf{(x - 1) {}^{2} + (x + 1)(x - 1)} \\ \implies \sf{x}^{2} + {(1)}^{2} - 2(x)(1) + {x}^{2} - {(1)}^{2 } \\ \implies \sf {x}^{2} + 1 - 2x + {x}^{2} - 1 \\ \implies \red{\sf 2 {x}^{2} - 2x}[/tex]
Hence, solved!
