(3a2 + 2a - 2) - (a2 - 3a + 7)
remember to distribute invibile -1simlify 2nd part-(a^2-3a+7)=-1(a^2-3a+7)=-a^2+3a-7now we have3a^2+2a-2-a^2+3a-7=3a^2-a^2+2a+3a-2-7=2a^2+5a-9