Question

Fill in the blanks​

(iii) ​$5\times 4=\underset{–}{}$ and $5x\times 4y=\underset{–}{}$

Answer 1

Find the product of $5$ and $4$
To find: $5\times 4$
$5\times 4=20$

Find the product of $5x$ and $4y$
To find: $5x\times 4y$

The multiplication of monomials can be performed
by multiplication of their coefficients and literals

$\therefore 5x\times 4y$
$=(5\times 4)\times (x\times y)$
$=20\times xy$
$=20xy$

Hence $5\times 4=20$ and $5x\times 4y=20xy$