6.
4x^2 + 4 = 0
Divide both sides by 4
x^2 + 1 = 0
Use the quadratic formula since this cannot be factored.
x = (-b +- sqrt(b^2 - 4ac))/(2a)
x = +- sqrt(-4(1)(1))/2
x = +- sqrt(-4)/2
x = +- 2i/2
x = +- i
x = i or x = -i
Quicker solution:
If you have x^2 = number, then
x = +- sqrt(number)
Once you get to
x^2 + 1 = 0
Subtract 1 from both sides
x^2 = -1
Apply the quick method
x = +- sqrt(-1)
x = +- i
8.
2x^2 + 50 = 0
Divide both sides by 2
x^2 + 25 = 0
Subtract 25 from both sides
x^2 = -25
Apply quick method
x = +- sqrt(25)
x = +- 5i
x = 5i or x = -5i
THe answe is 6x squared on the number line
Answer:
$146.58
Step-by-step explanation:
Price of 1 notebook: $3.49
Price of 40 notebooks: 40 * $3.49 = $139.60
Sales tax is 5% of $139.60: 5% * $139.60 = 0.05 * $139.60 = $6.98
Price of 40 notebooks plus sales tax: $139.60 + $6.98 = $146.58
Answer: $146.58
