Answer:
"f(x) = (x + 3)(x – 7)"
Step-by-step explanation:
If the vertex is (h,k), then the quadratic is can be written in the form:
y = a (x-h)^2 + k
So it will be:
y = a(x-2)^2 - 25
Now, to find a, we need the x-intercept (which is 7), so we plug in 7 into x and 0 into y and solve for a:
0 = a(7-2)^2 - 25
0 = a(5)^2 - 25
0 = 25a - 25
a = 1
THus, we can write:
y = (x-2)^2 - 25
Expanding this, we get:
y = x^2 -4x + 4 - 25
y = x^2 - 4x - 21
y = (x-7)(x+3)
THis is correct answer.
It says 20% OFF, so you would do, 1 - 0.20 = 0.80, so you would multiply 0.80 with 80 and get 64.
Hi there!
Recall:
d = st, where:
d = distance
s = speed
t = time
We can set up an expression where the extra ten minutes is taken into account:
50x = 65(x - 10) <--- because J left 10 minutes after, we must subtract from the time variable, or "x".
Solve for x:
50x = 65x - 650
Subtract 65x from both sides:
-15x = -650
Divide both sides by -15:
x ≈ 130/3 or 43.33 min
Answer:
y=2
Step-by-step explanation:
12+8y=28
subtract 12 on both sides
8y=16
divide both sides with 8
y=2
plug in 2 for y back to the original equation to double check if its right
12+8(2)=28
28=28
hope this helps
idk theres an "x"