question\nexpress as a trinomial.\n$(x + 10)(3x + 10)$

Explanation:

Step1: Use FOIL method

$(x + 10)(3x+10)=x\times(3x)+x\times10 + 10\times(3x)+10\times10$

Step2: Simplify each term

$x\times(3x)=3x^{2}$, $x\times10 = 10x$, $10\times(3x)=30x$, $10\times10 = 100$

Step3: Combine like - terms

$3x^{2}+(10x + 30x)+100=3x^{2}+40x + 100$

Answer:

$3x^{2}+40x + 100$