If x is a whole number and 437 = (21 + x)(21 - x), then x =

2

Step-by-step explanation:

In general, .

So we have here that:

We went by itself first.

Subtract 441 on both sides:

Multiply both sides by -1:

Take the square root of boht sides:

So both 2 and -2 would satisfy the equation.

Only one of these is a whole number.

The whole numbers consist of the elements that you can count with and 0.

The whole number set is {0,1,2,3,4,5,6,7,...}

So 2 is the answer.

Check:

Replace x with 2:

437=(21+2)(21-2)

437=(23)(19)

437=437 is a true equation so 2 is definitely a solution.

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b

4.08%

step-by-step explanation: