Answers:
A = 3
B = -7
C = 3
D = -7
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Explanation:
You could use the AC method to factor, but I think the method described below is a more efficient way of factoring.
Set the given expression equal to zero and solve for x using the quadratic formula. So the goal is to find the roots for
We'll plug in a = 9, b = -42, and c = 49.
Because the root is x = 7/3, it leads to the factor 3x-7 = 0
Note that we go from x = 7/3 to 3x = 7 after multiplying both sides by 3. Then we subtract 7 from both sides.
It turns out that we have two copies of the identical factor (3x-7) because x = 7/3 is a double root.
So in reality we have the factorization (3x-7)(3x-7) which we can shorten into (3x-7)^2 if we wanted.
Use the box method or FOIL method to expand (3x-7)(3x-7) and you should get 9x^2-21x-21x+49 which simplifies to 9x^2-42x+49. This confirms we have the correct factorization.
Therefore, A and C are both 3, while B and D are both -7.
Answer: 1 squealer apart if on a square grid
Step-by-step explanation:
Answer:
To find the area of a composite figure or other irregular-shaped figure, divide it into simple, nonoverlapping figures. Find the area of each simpler figure, and then add the areas together to find the total area of the composite figure.
Step-by-step explanation:
Did this help, do you need an example
Answer:
about 66%
Step-by-step explanation:
I tested this with the number 50.
50 x 50% = 25
25 x 300% = 75
50 / 75 = 2 / 3 = 66%
To prove:
75 x 66% ≈ 50
Answer:
It's C. 1/20 = 5%
Step-by-step explanation:
You want to multiply the probability of each key for the two cars which is 1/5 × 1/4 because there are five keys. this gives you 1/20 when you multiply :)