Question

66x74 solve using identity

Answer 1

Answer:

The answer is 4884

Step-by-step explanation:

We can say 66=70-4

"       "      "    74=70+4

So 66x74=(70-4)(70+4)

               =(70)^2-(4)^2     [Using identity a^2-b^2=(a+b)(a-b)]

               =4900-16=4884

Hope u understand and this helps

Answer 2

Answer:

4886

Step-by-step explanation:

we know that (a+b)(a+c)=a²+a(b+c)+bc

(70-4)×(70+4)

here a=70

b= -4

c= 4

so by using identity

(70-4)(70+4)=(70)²+70(-4+4)+(-4×4)

=4900+70(0) +(-16)

=4900+0-16

=4886