Question

using Identity a 2-b2(a+b) (a - b) evalule
8BX 77​

Answer 1

Step-by-step explanation:

We are given the formula (a+b)(a−b)=a2−b2.

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)=82−(0.3)2⇒8.3×7.7=64−0.09⇒8.3×7.7=63.91.

Hence, 8.3×7.7=63.91.