Question

Please help! i will reward a lot!

Answer 1

`{x}^(2) - 9x - 10 = 0 \\ {x}^(2) - 10x + x - 10 = 0 \\ ( {x}^(2) - 10x) + (x - 10) = 0\\ x(x - 10) + 1(x - 10) = 0 \\ (x - 10)(x + 1) = 0 \\ x - 10 + x + 1 = 0 \\ collecting \: like \: terms \: \\ x + x - 10 + 1 = 0 \\ 2x - 9 = 0 \\ 2x = 0 + 9 \\ 2x = 9 \\ x = (9)/(2) \\ x = 4.5`