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### Grade 7 - Mathematics3.2 Find the Value of the Expression

 Example: Find the value of x3 when x=2. Solution:Substituting x value in the given expression, we get 23 = 2.2.2 = 8 Example: Find the value of x3 when x=-3. Solution: Substituting x value in the given expression, we get (-3)3 = (-3).(-3).(-3) = -27 Importance of enclosing the substituted value in parenthesis Example: Evaluate 5 - x2 for x=-2 Solution 1: Substituting x value in the given expression, with parentheses 5 - (-2)2 = 5 - (-2).(-2) = 5 - 4 = 1 ------> Correct answer Solution 2: Substituting x value in the given expression, without parentheses 5 - (-2)2 = 5 - -22 = 5 - -4 = 5 + 4 = 9 ------> Incorrect answer Directions: Find the value of given expressions. Also write at least ten examples of your own.
 Q 1: Find the value of 7(3x+9) when x=-2.21252320 Q 2: Find the value of 2x3 when x=4.95145128111 Q 3: Find the value of 3x3-2 when x=2. 26212422 Q 4: Find the value of (3x)2 when x=-2.34363832 Q 5: Find the value of (3x-1)2 when x=1.3421 Q 6: Find the value of 3(2x2+1) when x=1.7869 Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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