Question

find the errors in these questions ​

Answer 1

Answer:

The errors can be proved by applying algebraic identities .

Step-by-step explanation:

Here, for expression (d) .

(2x + y)(2x + y)  = 4x² + y²

The formula for identity (a + b)² = a² + b² + 2ab

Here, the expression is  (2x + y)(2x + y) = (2x + y)²

where, a = 2x

            b = y

Thus, the expression can be expanded as 4x² + y² + 4xy .

But, it is given as 4x² + y²  . This is the error .

Here, for expression (j)

(7x + 3)/3  =  7x

Firstly, we consider the LHS .

LHS =  (7x + 3)/3

        =  (7x/3) +  (3/3)

        =  (7x/3) + 1

But, RHS is given as 7x .

This is wrong and the error .