Calculus

Is there a particular reason that you cannot use your calcuator?

484*18 = 8712

cos x equals cos -x because cos is an even function. An even function f is such that f(x) = f(-x).

If you mean:

4x2 + x - 1 = 0

then:

4x2 + x = 1

x2 + x/4 = 1/4

x2 + x/4 + 1/64 = 17/64

(x + 1/2)2 = 17/64

x + 1/2 = ± √17 / 8

x = (-4 ± √17) / 8

Giving us two real solutions.

If on the other hand you mean:

4x2 + x + 1 = 0

Then:

4x2 + x = -1

x2 + x/4 = -1/4

x2 + x/4 + 1/64 = 15/64

(x + 1/2)2 = 15/64

x + 1/2 = ± √15 / 8

x = (-4 ± √15) / 8

Again, giving us two real solutions.

x(z+1) = xz + x

x=28

It is a riddle whose answer is: "X is negative three."

If you mean integral[(2x^2 +4x -3)(x+2)],

then multiply them out to get:

Integral[2x^3+8x^2+5x-6].

This is then easy to solve and is = 2/4x^4+8/3x^3+5/2x^2-6x +c

80 centimeters = 31.496063 inches

Yes, the tangent function is periodic.

x2+3x+1 = 0

Using the quadratic equation formula gives you:

(x+2.618033989)(x+0.3819660113) = 0

So: x = -2.618033989 or x = -0.3819660113

zero

Cubic inches or cubic meters. Take any unit of length and cube it and that is a unit for volume

23

The answer is -8.

y=8

9x + 9 = 135

9x = 126

x = 14

-106

The answer is x=10.

If:

x=20

y=8

z=4

then:

y=8/2=4

z=4*2=8

since x varies directly with y, meaning whatever happens to y, happens to x, so if y was divided by 2, then x should be divided by 2. After all, the inverse of division is multiplication.

Given, 3x2 - 4x = -2

Then, 9x2 - 12x = -6;

9x2 - 12x + 4 = -2 {completing the square} ;

3x - 2 = ±i√2 {sq rt of both sides} ; and

3x = 2 ± i√2.

Therefore,

x = ⅓(2 ± i√2).

x = - 4 - or + the square root of 3

Solved by using the quadratic equation formula.

p;kp;k;ko;jk;

No.