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AysviL [449]
3 years ago
15

If f(x) = 2х2 +1, what is f(x) when x = 3? оооо 19

Mathematics
1 answer:
jeka57 [31]3 years ago
7 0

Answer:

f(3) = 19

Step-by-step explanation:

Step 1: Define

f(x) = 2x² + 1

x = 3

Step 2: Substitute and Evaluate

f(3) = 2(3)² + 1

f(3) = 2(9) + 1

f(3) = 18 + 1

f(3) = 19

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Anna71 [15]

Answer:

55028.064

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3 0
3 years ago
Solve 2x + 5y = –13. 3x – 4y = –8
disa [49]
If you would like to solve 2x + 5y = - 13 and 3x - 4y = -8, you can do this using the following steps:

<span>2x + 5y = -13  /*4
3x - 4y = -8     /*5
</span>_________________
8x + 20y = -52
15x - 20y = -40
_________________
8x + 15x + 20y - 20y = -52 - 40
23x = -92    /23
x = -92 / 23
x = -4

<span>2x + 5y = -13
</span>2 * (-4) + 5y = -13
-8 + 5y = -13
5y = -13 + 8
5y = -5
y = -1

(x, y) = (-4, -1)

The correct result would be D.) <span>(-4, -1).</span>
8 0
3 years ago
Read 2 more answers
A carpenter is putting a skylight in a roof. If the roof measures 10 + 8 by 8 + 6 and the skylight measures + 5 by 3 + 4, what i
Usimov [2.4K]

Answer:

The area is: 77x^2 + 105x + 28, option b.

Step-by-step explanation:

Rectangular area:

The area of a rectangular space is given bt the multiplication of its measures.

Area of the roof:

Dimensions of 10x + 8 and 8x + 6. So

A_{r} = (10x+8)(8x+6) = 80x^2 + 60x + 64x + 48 = 80x^2 + 124x + 48

Area of the skylight:

Dimensions of x + 5 and 3x + 4. So

A_{s} = (x+5)(3x+4) = 3x^2+4x+15x+20 = 3x^2 + 19x + 20

What is the area of the remaining roof after the skylight is built?

Total subtracted by the skylight, which is a subtraction of a polynomial, in which we subtract the like terms. So

A_{r} - A_{s} = 80x^2 + 124x + 48 - (3x^2 + 19x + 20) = 80x^2 - 3x^2 + 124x - 19x + 48 - 20 = 77x^2 + 105x + 28

The area is: 77x^2 + 105x + 28, option b.

3 0
3 years ago
1284 divided by 26 also need a remainder
VARVARA [1.3K]
Using a calculator I put 1,284/26=49.384615385. Rounded to tenth: 49.4 :)
8 0
3 years ago
Margaret manages a second-hand clothing store. The store advertises that is you buy 3 items, you will get 15% off the most expen
denis23 [38]
The answer to this question would be $49.33
7 0
4 years ago
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