a) Factor 9x² + y² + z² - 6xy + 2yz - 6xz
This looks a lot like
(x+y+z)² = x² + y² + z²+ 2xy + 2yz + 2xz
except instead of x there's (-3x). So this must be
(-3x+y+z)² = (-3x)² + y² + z² + 2((-3x)y + (-3x)z + yz)
= 9x² + y² + z² - 6xy + 2yz - 6xz
Looks good.
Answer: (-3x+y+z)²
Since it's a square we could also negate the inside and write this (3x-y-z)²
b) I'll guess that says we want to evaluate this when x=1, y=2, z= -1
(-3(1) + 2 -1)² = (-2)² = 4
Answer: 4
<span>y−5=−2/3(x+9)
</span><span>y−5=−2/3x - 6
</span>y=−2/3x +1
y=−2/3x +1
This graph would look like relatively steep negative graph, with a y-intercept of 1.
12 bro it even says to follow the order of operations. If there is only addition and subtraction you just go from left to right. Same with if there is only multiplication and division.
Congruent means like the same thing so i would say the 2 right one which might be (B and D i guess) hope it helps and have a great day
Cool you're in K12 so am I. <span />
