### Theory:

Learn the steps to do the subtraction of algebraic expressions:
• Arrange the terms of the given expressions in the same order.
• Write the given expressions in two rows in such a way that the like terms occur one below the other, keeping the expression to be subtracted in the second row.
• Change the sign of each term in the lower row from $$+$$ to $$-$$ and from $$-$$ to $$+$$.
• After changing the signs of the terms in the lower row, add the terms column-wise.
Example:
Subtract $$3x² - 6x - 4$$ from $$5 + x - 2x²$$.

That is, we have to find the difference of $$5 + x - 2x^2$$ and $$3x^2- 6x - 4$$.

Arrange the terms of the given expression in the same order.