Help whats the answer

Mathematics

1 answer:

Gnom [1K]3 years ago

8 0

Answer:36cm

Step-by-step explanation:

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Find the value of a.<br> 4x + ax = - 2x(2x + 1)

Karo-lina-s [1.5K]

Answer:

a = -2(2x+1)-4

Step-by-step explanation:

1. Factor out the common term x.

x(4+a)= -2x(2x+1)

2. Cancel x on both sides.

4+a= -2(2x+1)

3. Subtract 4 from both sides.

a= -2(2x+1)-4

3 0

3 years ago

In a particular region there is a uniform current density of 18 a/m2 in the positive z direction. what is the value of line inte

Ugo [173]

By Stokes' theorem, the integral is 0. If $R$ is the triangular region bounded by the given line segments composing the curve $C$ , then

$\displaystyle\int_{\partial R}\mathbf b\cdot\mathrm d\mathbf s=\iint_R\nabla\times\mathrm d\mathbf r$

where $\nabla\times F=\mathrm{curl}(0,0,18)=0$ .

Just to verify this, we can parameterize the path by

$C=C_1\cup C_2\cup C_3$
$\begin{cases}C_1:=\{(4d,3dt,0)~|~0\le t\le1\}\\C_2:=\{(4d(1-t),3d(1-t),0)~|~0\le t\le1\}\\C_3:=\{(4dt,0,0)~|~0\le t\le1\}\end{cases}$

$\displaystyle\int_C\mathbf b\cdot\mathrm d\mathbf s$
$=\displaystyle\int_0^1(0,0,18)\cdot(0,3d,0)\,\mathrm dt+\int_0^1(0,0,18)\cdot(-4d,-3d,0)\,\mathrm dt+\int_0^1(0,0,18)\cdot(4d,0,0)\,\mathrm dt$
$=0+0+0=0$