Question

For an expression to be divisible by another algebraic expression the divisor should be a factor of the dividend.

Answer 1

For an expression to be divisible by another algebraic expression the divisor should be a factor of the dividend.
$Dividend=Divisor\times Quotient+Remainder$. If an expression is divisible by another algebraic expression the remainder is 0.
So, dividend is the product of divisor and quotient. Therefore, divisor and quotient are the factors of dividend.