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.
 
2x² + x+5+3x² 6x4()  (+) (+)5x² +7x+9¯¯