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Grade 8 - Mathematics7.47 Solving using Formula - I

 Example: Using appropriate formula and find the value of (98)2. Solution: We can change the given problem like (100-2)2. This is in the form of (a-b)2, so we can use this formula, (100-2)2 = (100)2 - 2.100.2 + (2)2 = 10000 - 400 + 4 = 10004 - 400 = 9604 Directions: Solve the following problems using appropriate formula. Also write at least ten examples of your own.
 Q 1: Using appropriate formula and find the value of (46)2.2,9162,1162,8163,216 Q 2: Using appropriate formula and find the value of (103)2.10,60912,60911,60911,706 Q 3: Using appropriate formula and find the value of (54)2.None of these2,9162,8163,216 Q 4: Using appropriate formula and find the value of (96)2.9,2169,4169,6169,316 Q 5: Using appropriate formula and find the value of (998)2.99,60496,004986,004996,004 Q 6: Using appropriate formula and find the value of (206)2.45,43642,43644,43643,436 Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!