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- Oct 21st 2012, 11:37 AMMajorGriffSomeone care to explain? The -1 + 12?
- Oct 21st 2012, 11:46 AMskeeterRe: Someone care to explain? The -1 + 12?
the process is called completing the square ...

$\displaystyle -3(x^2 + 4x) - 1$

$\displaystyle \color{red}{-3}\color{black}{(x^2 + 4x} \color{red}{+4}\color{black}{) - 1} \color{blue}{+ 12}$

adding -3(4) is equivalent to adding -12 to the expression ... adding +12 balances the value of the expression.