State whether the equation is a linear equation in one variable or not. –2x(–2 – x) = x + 1

If you'll simplify this equation -2x(-2-x)=x+1you'll get 4x+2x²=x+1simplify further 2x²+3x-1this one looks like a quadratic equation.Thus, this is not a linear equation,

[tex]-2x(-2 -x) = x + 1\\
4x+2x^2=x+1[/tex]It's not linear. It's quadratic.