Use FOIL in Polynomial Multiplication
-$$( x + 9 ) ( x - 5 )$$
A) $x ^ { 2 } + 4 x - 45$
B) $x ^ { 2 } - 45 x + 4$
C) $x ^ { 2 } + 3 x - 45$
D) $x ^ { 2 } + 4 x + 4$

Question

Quizplus · Accepted Answer

Using FOIL (First, Outer, Inner, Last) to multiply the polynomials: First: $x \cdot x = x^2$, Outer: $x \cdot (-5) = -5x$, Inner: $9 \cdot x = 9x$, Last: $9 \cdot (-5) = -45$. Combining these gives $x^2 + 4x - 45$.

Use FOIL in Polynomial Multiplication - (x+9)(x−5)( x + 9 ) ( x - 5 )(x+9)(x−5)

Use FOIL in Polynomial Multiplication
- $( x + 9 ) ( x - 5 )$