Find the product.Simplify your answer. (3x+1)(x-4) square

Expand the parentheses<br />${3x}\times x+{3x}\times (-4)+{1}\times x+{1}\times (-4)$ <br />Simplify<br />$3{x}^{2}-12x+x-4$ <br />Combine like terms<br />$3{x}^{2}+(-12x+x)-4$ <br />Combine coefficients of like terms<br />$3{x}^{2}+(-12+1){x}-4$ <br />Calculate<br />$3{x}^{2}-11x-4$ <br />