Step-by-step explanation:
If you want to multiply a parenthesis by a number, you simply distribute the number to all the terms in the parenthesis.
So, if you want to multiply the parenthesis
(3xβ7) by 5, you need to multiply by 5
both 3x and β7.
We have that 5β
(3x)=5β
(3β
x)=(5β
3)β
x=15x and β7β
5=β35
So, 5(3xβ7)=15xβ35