Grade 7 - Mathematics 2.14 Value of an Expression - III

Example: Find the value of an expression 2x^{2}+7x+3 when x=2.

Solution: Substituting the value of x in the given equation,
2*2^{2} + 7*2 + 3 = 2*4 + 14 + 3
8 + 14 + 3 = 25.
Therefore the value of given expression is 25.

Directions: Solve the following problems. Also write at least 10 examples of your own.