Question 557557
You're doing great so far. I'm going to pick up where you left off.



{{{ a ( a - 10 )  =   -21  }}}



{{{ a^2- 10a  =   -21  }}}



{{{ a^2- 10a+21 = 0  }}}



{{{ (a-7)(a-3) = 0  }}}



{{{ a-7=0}}} or {{{a-3 = 0  }}}



{{{ a=7}}} or {{{a=3}}}



Now use these values of 'a' to find the remainder.


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