Question

a2+b2=(a+b)(a-b)
using this formula solve that-


$(24522) ^{2} - (45.23) {}^{2} =$

​

Answer 1

Answer:

We are given the formula (a+b)(a−b)=a

2

−b

2

.

We know, 8.3×7.7=(8+0.3)(8−0.3),

where a=8 and b=0.3.

Now, solve as shown below:

8.3×7.7

=(8+0.3)(8−0.3)=8

2

−(0.3)

2

⇒8.3×7.7=64−0.09

⇒8.3×7.7=63.91.

Hence, 8.3×7.7=63.91.