Question 91811
Question:


Multiply

(x - 10)(x + 9)


Answer:


(x - 10)(x + 9) = x (x + 9)- 10 (x + 9)


==> x*x + x*9 - 10*x -10*9


==> {{{ x^2 + 9x - 10x - 90 }}}


==> {{{ x^2   - 1x - 90 }}}



Hope you found the explanation useful.


Regards.


Praseena.