### Home > CCA2 > Chapter 4 > Lesson 4.1.1 > Problem4-8

4-8.

Solve each equation below. Think about Rewriting, Looking Inside, or Undoing to simplify the process. Homework Help ✎

1. $2(x − 1)^2 + 7 = 39$

Use Undoing.

$2(x−1)^{ }2=3\\2(x−1)^2=16$

Look inside.

$x−1=\pm4$

$x=−3,5$

1. $7 ( \sqrt { m + 1 } - 3 ) = 21$

See part (a) for possible strategies.

$m=35$

1. $\frac { x } { 2 } + \frac { x } { 3 } = \frac { 5 x + 2 } { 6 }$

Start by multiplying both sides by $6$.

Check your answer in the original equation to be sure you have found a reasonable solution.

1. $- 7 + ( \frac { 4 x + 2 } { 2 } ) = 8$

$\frac{4x+2}{2}=15$