All you have to do is replace every x with 2 and then solve:
<em>Make to sure to follow the Order of Operations!!</em>
-9x(2) + 11x - 7 =
(-9 × 2 × 2) + (11 × 2) - 7 =
-36 + 22 - 7 =
-14 - 7 =
-21
The answer is -21.
Hope that helps!
Answer:
(4, 6 )
Step-by-step explanation:
Given the 2 equations
3x + 4y = 36 → (1)
y = - 
x + 8 → (2)
Substitute y = - x + 8 into (2)
3x + 4(- x + 8) = 36 ← distribute and simplify left side
3x - 2x + 32 = 36
x + 32 = 36 ( subtract 32 from both sides )
x = 4
Substitute x = 4 into (2) for corresponding value of y
y = - × 4 + 8 = - 2 + 8 = 6
solution is (4, 6 )
Answer:
x= -7 , 3
Step-by-step explanation:
x^2 + 4x + 4 = 25
I will use completing the square. The left side is a perfect square
(x+2) ^2 = 25
Take the square root of each side
sqrt((x+2) ^2) = sqrt(25)
x+2 = ±5
Subtract 2 from each side
x+2-2 = ±5 -2
x = ±5 -2
x =-5-2 x = 5-2
x = -7 x = 3
