Question

(x + 2)(x + 4)

Answer 1

Use distributive property:
\[(x+2)(x+4)=(x)(x)+(x)(4)+(2)(x)+(2)(4)\]
This is sometimes called "FOIL" (First Outer Inner Last).

Answer 2

Solve, using the substitution method.

j + k = 3
j – k = 7

A.
The solution is (8, 1)

B.
The solution is (5, –2)

C.
There is no solution.

D.
There are an infinite number of solutions.