# What is the standard form of y= 2(x-3)^3-x?

##### 1 Answer
Jul 25, 2016

$y = 2 {x}^{3} - 18 {x}^{2} + 53 x - 54$

#### Explanation:

Since ${\left(a + b\right)}^{3} = {a}^{3} + 3 {a}^{2} b + 3 a {b}^{2} + {b}^{3}$, you can write

$y = 2 \left({x}^{3} - 9 {x}^{2} + 27 x - 27\right) - x$

and then multiply:

$y = 2 {x}^{3} - 18 {x}^{2} + 54 x - 54 - x$

$y = 2 {x}^{3} - 18 {x}^{2} + 53 x - 54$

that's the standard form