Question

A decimal number is multiplied by itself. If the product is 51.84, find the number

Answer 1

if the number  is multiplied by itself it will be its square

there fore

let the number be x

as it is multiplied by itself it is its square

so 

x² = 51.84

x = 7.2

therefore the decimal number is 7.2

Answer 2

this is the question from the lesson algebra so the number given is 51.84 so we don't know the number so let us take it as the variable b square means we should multiply the equation means the process is so 

b² = 51.84

x = 7.2
therefore the answer is x=7.2