Question 171894
{{{(a^2+ab-3b^2)+(4a^2-ab+b^2)}}} Start with the given expression



{{{a^2+ab-3b^2+4a^2-ab+b^2}}} Remove the parenthesis



{{{(a^2+4a^2)+(ab-ab)+(-3b^2+b^2)}}} Group like terms



{{{5a^2-2b^2}}} Combine like terms



So {{{a^2+ab-3b^2+4a^2-ab+b^2=5a^2-2b^2}}}