Answer:
B. (x - 2)(x + 2)
Step-by-step explanation:
The answer is b. If you have (x + a)(x - a), the variables will cancel each other out. For example, if we take the answer (x - 2)(x + 2) and factor it out, we get:
x² - 2x + 2x - 4
Then it becomes just:
x² - 4 because the x to the power of one has been canceled. This proves his theory wrong.
Answer:
-11
Step-by-step explanation:
Answer:
B. Negative
Step-by-step explanation:
A discriminant of zero indicates that the quadratic has a repeated real number solution. A negative discriminant indicates that neither of the solutions is a real number.
Answer:
x = 10
Step-by-step explanation:
3
Answer:
D (t) = 30 * t
Step-by-step explanation:
If we look closely, it would become a right triangle according to the statement, therefore:
a ^ 2 + b ^ 2 = c ^ 2
Because they give us the speed in each case, the distance would be that speed by time therefore, we know that:
a = 18 * t
b = 24 * t
c = d
replacing we have:
D ^ 2 = (18 * t) ^ 2 + (24 * t) ^ 2
D ^ 2 = 324 * t ^ 2 + 576 * t ^ 2
D ^ 2 = 900 * t ^ 2
D = (900 * t ^ 2) ^ (1/2)
D = 30 * t
Therefore the function of D is 30 * t
