Use the FOIL method to find the product. Express the product in descending powers of the variable.
-$$( x + 10 ) ( 7 x - 10 )$$
A) $7 x ^ { 2 } + 60 x - 100$
B) $7 x ^ { 2 } + 58 x - 100$
C) $7 x ^ { 2 } - 100 x + 60$
D) $7 x ^ { 2 } + 60 x + 60$

Question

Quizplus · Accepted Answer

Using the FOIL method, we multiply the first terms, outside terms, inside terms, and last terms respectively: $x \cdot 7x = 7x^2$, $x \cdot (-10) = -10x$, $10 \cdot 7x = 70x$, and $10 \cdot (-10) = -100$. Adding these together gives $7x^2 + 60x - 100$.

Use the FOIL Method to Find the Product (x+10)(7x−10)( x + 10 ) ( 7 x - 10 )(x+10)(7x−10)

Use the FOIL Method to Find the Product $( x + 10 ) ( 7 x - 10 )$