# What should be subtracted from 7x xÂ² + x - 12 to get x + 4?

$\begin{array}{l}\text{Let}\ y\ \text{should be substractd}\\ \text{Hence}\\ 7x^2+x-12-\left(y\right)=x+4\\ \Rightarrow\ y=7x^2+x-12-x-4=7x^2-16\ \\ \text{So},\ y=7x^2-16\end{array}$

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