Question

I need a help!!...
Simplify the following by using:- ( a²-b²) = (a+b)×(a-b)
i) 68×72 =_____

Plzz tell the answer step by step!!...​

Answer 1

Answer:

8649

Step-by-step explanation:

68×72

68×72we can also write it as:

68×72we can also write it as:(70-2) (70+2)

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)(70^2) z (2^2)

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)(70^2) z (2^2)4900-4

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)(70^2) z (2^2)4900-44896

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)(70^2) z (2^2)4900-44896(2) 93^2

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)(70^2) z (2^2)4900-44896(2) 93^2100-7^2

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)(70^2) z (2^2)4900-44896(2) 93^2100-7^2using identity property (a-b)^2 = a^2 + b^2 - 2ab

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)(70^2) z (2^2)4900-44896(2) 93^2100-7^2using identity property (a-b)^2 = a^2 + b^2 - 2ab(100)^2 + (7)^2 - 2 × 100 × 7

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)(70^2) z (2^2)4900-44896(2) 93^2100-7^2using identity property (a-b)^2 = a^2 + b^2 - 2ab(100)^2 + (7)^2 - 2 × 100 × 710000 + 49 - 1400

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)(70^2) z (2^2)4900-44896(2) 93^2100-7^2using identity property (a-b)^2 = a^2 + b^2 - 2ab(100)^2 + (7)^2 - 2 × 100 × 710000 + 49 - 140010049 - 1400

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)(70^2) z (2^2)4900-44896(2) 93^2100-7^2using identity property (a-b)^2 = a^2 + b^2 - 2ab(100)^2 + (7)^2 - 2 × 100 × 710000 + 49 - 140010049 - 1400 = 8649

68×72we can also write it as:(70-2) (70+2)using identity property = (a+b) × (a-b) = ( a^2 - b^2)(70^2) z (2^2)4900-44896(2) 93^2100-7^2using identity property (a-b)^2 = a^2 + b^2 - 2ab(100)^2 + (7)^2 - 2 × 100 × 710000 + 49 - 140010049 - 1400 = 8649I HOPE IT HELPS YOU