4 years ago

Factor by grouping x^3-4x^2+7x-28

Mathematics

1 answer:

Komok [63]4 years ago

5 0

Answer:

(x - 4)(x^2 + 7)

Step-by-step explanation:

x^2 is a factor of the first two terms: x^3 - 4x^2 = x^2(x - 4).

7 is a factor of the last two terms: 7(x - 4).

Note how (x - 4) is a factor of the entire four-term expression given above.

Then: x^3-4x^2+7x-28 = (x - 4)(x^2 + 7)

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Question 2:

Helga [31]

Answer:

15mins

Step-by-step explanation:

Given that he worked out a total of 360mins, and jogged 45mins/day:

$Jog \ Time=Total \ Time- Bike \ Time\\=360-(45\times6)\\=90min$

Therefore, Allen jogged a total of 90mins in the past one week. To calculate the time jogged each day, we divide the total jog time by number of days jogged:

$t_d=Total \Time/(No \of \ Days)\\=90/6\\=15mins$

Allen jogged 15mins per day.

6 0

3 years ago

Solve the equation in the complex number system X^2+x+8=0

Vera_Pavlovna [14]

Answer: x² + x + 8= 0

hope it's help

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3 years ago

3. A ball bounces and you are launching a rock to hit it. The equation of the ball bouncing is

natka813 [3]

Answer:

When x = 6.

Step-by-step explanation:

WE need to solve the system:

y = - x^2 + 4x + 4

y = -2x + 4

Equating:

- x^2 + 4x + 4 = -2x + 4

0 = x^2 - 4x - 4 - 2x + 4

x^2 - 6x = 0

x(x - 6) = 0

x = 0, 6.

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3 years ago

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umka2103 [35]

2b + 34greater then or equal to 54

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3 years ago

8 + 9x + 4(11 -- 2x)<br><br> -41-2x – 7) + 6x - 7<br><br> 9 - 31–4 + 3x) + 12x

kiruha [24]

Answer:

240766 - 52731x + 840x^2 + 144x^3

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3 years ago