Write a two-digit number ... a that has 9 tens and 1 ones; .

Mathematics

1 answer:

s344n2d4d5 [400]3 years ago

3 0

Answer: 91

Step-by-step explanation:

9 tens= 90
1 ones= 1
90+1=91

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Evaluate 7x - (2x)2 + x 3 for x = -2.

V125BC [204]

$7x - (2x)2 + {x}^{3}$

$7x - 4x + {x}^{3}$

$3x + {x}^{3}$

$3( - 2) + { (- 2)}^{3}$

$- 6 + - 8$

$- 14$

7 0

4 years ago

Find the domain of -1/x^2-4

Ipatiy [6.2K]

Answer:

$\mathbb{R}-\{0\}$

$(-\infty,0)\ U\ (0,+\infty)$

Step-by-step explanation:

<u>The domain of a Function</u>

Given a real function f(x), the domain of f is made of all the values x can take, such that f exists. The function given in the question is

$\displaystyle f(x)=-\frac{1}{x^2}-4$

Finding the domain of a function is not possible by giving x every possible value and check if f exists in all of them. It's better to find the values where f does NOT exist and exclude those values from the real numbers.

Since f is a rational function, we know the denominator cannot be 0 because the division by 0 is not defined, so we use the denominator to find the values of x to exclude from the domain.

We set

$x^2=0$