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Vladimir [108]
2 years ago
7

What is the determinant ? ANS : -2 plz help me with process​

Mathematics
1 answer:
WITCHER [35]2 years ago
6 0

Answer:

(-2)

Step-by-step explanation:

We have to find the determinant of the given matrix,

A=\begin{bmatrix}(a-1) & (a^2-a+1)\\ (a+1) & (a^2+a+1)\end{bmatrix}

det A = (a - 1)(a² + a + 1) - (a + 1)(a² - a + 1)

         = a(a² + a + 1) - 1(a²+ a + 1) - a(a² - a + 1) - 1(a² - a + 1)

         = a³ + a² + a - a² - a - 1 - a³ + a² - a - a² + a - 1

         = (a³ - a³) + (-a² + a² - a² - a²) - 1 - 1

         = -2

Therefore, determinant of the given matrix is (-2).

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Andreyy89
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3 years ago
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Alex

Answer:

650 cm²

Step-by-step explanation:

Use the formula 2(lw+wh+lh)

Plug in the stuff: 2(5*9+9*20+5*20)=2(45+180+100)=2(325)=650 cm²

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3 0
3 years ago
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ArbitrLikvidat [17]

Answer:

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Step-by-step explanation:

So we know that 180= 5x+2+2x+9+8x+4 which simplifies to 180 = 15x+15. Subtract 15 from both sides to get 165=15x and then divide by 15 to get 11=x. NOw we can plug this into the three angles as x so t = 5*11+2, t=55+2, t=57, then u = 2*11+9, u=22+9, u=31, and lastly v=8*11+4, v= 88+4, and v=92

7 0
3 years ago
An airplane is sighted at the same time by two
tiny-mole [99]

I got 2.2

Step-by-step explanation:

I probably did the math wrong but i did my best and i hope this helped even a little!

4 0
2 years ago
Need help ASAP DUE SOON AND PLEASE SHOW WORk!!!!
Svetradugi [14.3K]

Answer:

87.92 inches cubed or 87.92 in.^3

Step-by-step explanation:

The base of a cylinder is a circle, so we need to calculate the area of the circle first. The equation for the area of a circle is:

area (a) = pi * r^2 =3.14*2*2 =12.56sq.inches

again,

volume of cylinder = area of the base * the height

= 12.56 * 7

= 87.92 inches cubed or 87.92 in.^3

5 0
3 years ago
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