Question

Factorise :x²-10x+9​

Answer 1

${x}^{2} - 10x + 9 = 0$

${x}^{2} - 9x - x + 9 = 0$

$x(x - 9) - 1(x - 9) = 0$

$(x - 9) = 0 \\ or \\ (x - 1) = 0$

$x = 9 \: or \: x = 1$