How do you solve for z: 4(z + 3) = 72?

Feb 21, 2016

You must first distribute the parentheses.

Explanation:

To distribute the parentheses means to multiply each term inside the Parentheses with the term(s) directly outside to the left of the parentheses.

Ex: $2 \left(x + 4\right) = 2 x + 8$, since the 2 is multiplied with the x and with the 4.

Now to the equation:

$4 \left(z + 3\right) = 72$

$4 z + 12 = 72$

$4 z = 60$

$z = 15$

Hopefully this helps!