15*19=285
base times height is the formula
1.1 Factoring: 4x2+9y2+16z2-6xy-12yz-8xz
Thoughtfully split the expression at hand into groups, each group having two terms :
Group 1: -6xy-12yz
Group 2: 16z2-8xz
Group 3: 4x2+9y2
Pull out from each group separately :
Group 1: (x+2z) • (-6y)
Group 2: (x-2z) • (-8z)
Group 3: (4x2+9y2) • (1)
Looking for common sub-expressions :
Group 1: (x+2z) • (-6y)
Group 3: (4x2+9y2) • (1)
Group 2: (x-2z) • (-8z)
The inequality would look like this:
-2 (3x + 2)

-6x-4
To begin to find the solutions, distribute the -2 throughout the set of parenthesis on the left side of the inequality by multiplying the -2 by each term in the set of parenthesis
-2 x 3x = -6x
-2 x 2 = -4
-6x -4

-6x-4
Begin to isolate x by performing the opposite operation of adding -6x on both sides of the inequality
0x -4

-4
Next perform the opposite operation by adding 4 on both sides of the inequality
0x

0
Now, I'm not exactly understanding how that can possibly work. So, I guess I didn't really help you. But add a comment so that we can talk about the problem :)
Answer:
(B) x=2
Step-by-step explanation:
4(x + 6) - 3x = 26
4x+24-3x=26
x+24=26
Subtarct 24 from both sides
x=2