Question

Expand $(x-8)(x-10)$.

• A. $x^2-18x-80$
• B. $x^2+18x-80$
• C. $x^2-18x+80$
• D. $x^2+18x+80$

Answer 1

The correct option is C $x^2-18x+80$

$(x-a)(x-b)=x^2-(a+b)x+ab$

$(x-8)(x-10)=x^2-(8+10)x+\left(8\right)\left(10\right)=x^2-18x+80$