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### Grade 7 - Mathematics4.39 Solving Problems Using Formula for a2-b2

 Example: Find the value of 49*51 using formula. Solution: We can write 49*51 = (50-1)(50+1) This is the form of (a-b)(a+b) = a2-b2 = 502-12 = 2500-1 = 2499 Directions: Solve the following problems using formula.
 Q 1: Find the value of 69*71 using formula.499849894899 Q 2: Find the value of 501*499 using formula.24999926999924999 Q 3: Find the value of 109*111 using formula.12991290912099 Q 4: Find the value of 32*28 using formula.796896996 Q 5: Find the value of 62*58 using formula.359639564596 Q 6: Find the value of 102*98 using formula.998699969976 Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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