If the minimum value of the function f (x) = x square - 2x + C is 2, then the real number C=

If the minimum value of the function f (x) = x square - 2x + C is 2, then the real number C=

F (x) = xsquare - 2x + C
=x²-2x+1+c-1
=(x-1)²+(c-1)
c-1=2
x=3

What's the difference between square root and cube root?

A. There is only one cube root of a positive number
And there are two square roots. The one that is not negative is called arithmetic square root
B. Negative numbers have cube roots but no square roots

If the cubic root of 200A is a negative integer, what is the maximum value of integer a?

Mass factor of 200A decomposition
The degree of each factor is a multiple of 3
200a=2³×5²×a
The number of times is a multiple of 3‘
If you multiply 5 by 5, the number of times of 5 is a multiple of 3
So a max is - 5

If the cubic root 400A is an integer, what is the largest negative integer a

∵ 400 = 8 × 50 = 2 × 5 × 2, so in order to make 400A the cube of an integer, the largest negative integer of a is; - 5 × 2 = - 20

What is the ideal bridge in the bridge of mind
The bridge of mind

Set up ideal and belief in heart

Practical problems and linear equation with one variable (personnel allocation and numerical problems)
2. For a three digit number, the sum of the numbers on the three digits is 17, the number on the hundred digit is 7 times larger than the number on the ten digit, and the number on the one digit is 3 times of the number on the ten digit

If the tens are x, the single digit is 3x and the hundreds are x + 7
∴3x+x+x+7=17
x=2
3x=6
x+7=9
This three digit number is 926

A. B is 135 kilometers away from the two places. Two cars drive from a to B. the big car starts 5 hours earlier than the small car, and the small car arrives 30 minutes later than the big car. It's too late
Know that the speed ratio of the car and the big car is 5:2, and find the speed of the two cars
I know what the equation is, but can you explain why it is 5h-30min?

If the speed is set to be 5x and 2x, the following results can be obtained:
135/2x-135/5x=5-30/60;
Because the big car starts 5 hours earlier and the small car arrives 30 minutes later, the actual travel time of the big car is 5-30 / 60 = 4.5 hours
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As shown in Figure 1, the line segments AB and CD intersect at point O and connect AD and CB. We call the figure in Figure 1 "figure 8". As shown in Figure 2, under the condition of Figure 1, the bisectors AP and CP of ∠ DAB and ∠ BCD intersect at point P, and intersect with CD and ab at M and N respectively. Try to answer the following questions: (1) in Figure 1, if ∠ a + ∠ d = 80 °, then ∠ B + ∠ C=______ In Figure 2, the number of "8-shaped" is as follows:______ (2) in Figure 2, if ∠ Dao = 50 °, OCB = 40 °, P = 35 °, try to find the degree of ∠ D; (3) in Figure 2, if ∠ d = x °, B = y °, other conditions remain unchanged, try to find the degree of ∠ P

(1) According to the theorem of the sum of internal angles of triangles, ∠ AOD = 180 ° - (∠ a + ∠ d) = 180 ° - 80 ° = 100 °, ∠ BOC = 180 ° - (∠ B + ∠ C), ∫ AOD = ∠ BOC (equal to the vertex angle), ▽ B + ∠ C = 180 ° - 100 ° = 80 °, as shown in Figure 2, the "figure 8" with point o as the vertex has △ AOD and △ BOC, △ BOC

It is known that after each box is taken out of 24 kg, the sum of the remaining boxes is equal to the weight of the original box?

If 24 times 4 is known, the rest is a box, then 96 divided by 3, the answer is 32

(3a-2b-c)(3a-2b+c)