Question

Which among the following is a monomial expression?

• A. $2y+7$
• B. $3x+4y+5z$
• C. $10a$
• D. $90+76d$

Answer 1

The correct option is C $10a$

$\underset{–}{\text{Monomial Expression:}}$
A monomial algebraic expression is a type of algebraic expression which has only one term in it.
Examples of monomial expression include $2x,5y,10z,etc.$

Classification of algebraic expression on the basis of number of terms can be shown as:


$\bullet$ (a.) $\underset{–}{2y+7:}$
In option (a.), we have an algebraic expression of the form $2y+7$. It contains $2$ terms, $2y$ and $7$ in it and hence, it is a binomial and not a monomial.

$\bullet$ (b.) $\underset{–}{3x+4y+5z:}$
In option (b.), we have an algebraic expression of the form $3x+4y+5z$. It contains $3$ terms, $3x,4y$ and $5z$ in it and hence, it is a trinomial and not a monomial.

$\bullet$ (c.) $\underset{–}{10a:}$
In option (c.), we have an algebraic expression of the form $10a$. It contains only $\underset{–}{1}$ term, $10a$ in it and hence, it is a $\underset{–}{\text{monomial}}$.

$\bullet$ (d.) $\underset{–}{90+76d:}$
In option (d.), we have an algebraic expression of the form $90+76d$. It contains two terms, $90$ and $76d$ in it and hence, it is a binomial and not a monomial.

Therefore, option (c.) is the correct answer.