Question

Evaluate using identites
72*67

Answer 1

Answer:

5180 IS THE CORRECT ANSWER.

There is some wrong number in the question. so i will take 72*68

Step-by-step explanation:

Hello mate!!

To find :  

• 72 X 68 using suitable identity

We know that :

1. $(a+b)^2=a^2+b^2+2ab$
2. $(a-b)^2=a^2+b^2-2ab$
3. $a^2+b^2=(a+b)(a-b)$

Here :

• $a=72=70+2$
• $b= 68 = 70 - 2$

We will use the third identity here :

• $(72+2)(72-2)$
• $72^2-2^2$
• $(72X72)(2X2)$
• $5184-4$

• $5180$

5180 IS THE CORRECT ANSWER.