Apply Distributive Property: Apply the distributive property (also known as the FOIL method) to multiply the two binomials (x+7) and (x+3).(x+7)(x+3)=x(x)+x(3)+7(x)+7(3)
Perform Multiplication: Perform the multiplication for each term.x(x)=x2x(3)=3x7(x)=7x7(3)=21
Combine Like Terms: Combine like terms.x2+3x+7x+21=x2+(3x+7x)+21
Add Coefficients: Add the coefficients of the x terms.3x+7x=10x
Write Final Trinomial: Write the final trinomial. x2+10x+21