Question

If a = -1 and b = 2, find ab + ba.

Answer 1

Answer:

ab + ba = -4

Step-by-step explanation:

Given that ;

a = -1

b = 2

ab = -1 × 2

= -2

ba = 2 × ( -1 )

= -2

Hence ;

ab + ba

= ( -2 ) + ( -2 )

= -4

Answer 2

• We have to evaluate the above expression by using the given data.

               Given data:- $a=-1,b=2.$

               To find:- Value of above expression $ab+ba.$

               Solution:-

• To solve the above equation we will follow the BODMAS rule.

• BODMAS is an order of mathematic operations.

• BODMAS rule is to be followed while solving expressions in mathematics. It stands for,

           B= bracket

           O= order of power or rules

           D= division

           M= multiplication

           A= addition

           S= subtraction

 Now put the value a and b in the given equation we get,

        $ab+ba\\=>(-1)\times(2)+(2)\times(-1)\\=>(-2)+(-2)\\=>-4.$

    Hence we will get the value is $-4.$