Answer:
x = ±√11 +2
Step-by-step explanation:
Given in the question an equation,
x²- 4x - 7 = 0
Step 1
take 7 to the right side of equation
x²- 4x = 7
Step 2
To create a trinomial square on the left side of the equation, find a value that is equal to the square of half of b, the coefficient of x
2ab = -4x
2xb = -4x
b = -2
Step 3
Take square of b and add it to each side of the equation.
x²- 4x + (-2)²= 7 + (-2)²
x²- 4x + 4 = 7 + 4
x²- 4x + 4 = 11
Step 4
Factor the perfect trinomial square
(x−2)² = 11
Step 5
take square root on both sides
√(x−2)² = √11
(x-2) = ±√11
x = ±√11 +2
4 is a composite number.
4 is divisible by 2, so it's not prime
Answer:
city c
Step-by-step explanation:
city d increased by 8,
b increased by 4
a increased by 4
C increased by 9
Answer:
Rosa Parks's stand against segregation on a public bus led to the 1955 Montgomery Bus Boycott, and the violence targeted toward the Freedom Riders of the early 1960s drew the nation's attention to racial hatred in Alabama.
Step-by-step explanation:
Answer:
Irrational
Step-by-step explanation:
