# Can anyone help in solving this problem? 14u^3-7u^3-8u+4

## $14 {u}^{3} - 7 {u}^{3} - 8 u + 4$

May 1, 2018

The answer is $14 {u}^{4} - 7 {u}^{3} - 8 u + 4$.

#### Explanation:

The answer cannot be simplified further because the variables have different exponents. It could be simplified if you were given a value for $u$.

May 1, 2018

$f \left(u\right) = \left(2 u - 1\right) \left(\sqrt{7} - 2\right) \left(\sqrt{7} + 2\right)$

#### Explanation:

The equation most likely should be:
$f \left(u\right) = 14 {u}^{3} - 7 {u}^{2} - 8 u + 4$
Factor by grouping -->
$f \left(u\right) = 7 {u}^{2} \left(2 u - 1\right) - 4 \left(2 u - 1\right)$
$f \left(u\right) = \left(2 u - 1\right) \left(7 {u}^{2} - 4\right) = \left(2 u - 1\right) \left(\sqrt{7} u - 2\right) \left(\sqrt{7} + 2\right)$