Multiplying a Monomial by a Polynomial

$5x\times \left(b-c\right)$

Find the product: $a^2(2ab-5c)$

Find the product: $2x(3x+5xy)$

Multiply

$(ab+3bc-5ca)$ by $-3a^{2}bc$

Multiply the following polynomial.

$\mathrm{pq}({\mathrm{p}}^2-{\mathrm{q}}^2+1)$

Perform the following multiplication.

$\mathrm{xyz}(\mathrm{x}+\mathrm{y}+\mathrm{z})$

Perform the following multiplication.

$-3(-57+4\mathrm{abc})$

Perform the following multiplication.

$5({\mathrm{a}}^2-{\mathrm{b}}^2)$

Find the product $2\left(x+3\right)=k+6$, then find the value of $k$.