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Morgarella [4.7K]
3 years ago
6

Somebody help me out

Mathematics
1 answer:
Alekssandra [29.7K]3 years ago
3 0

Given Function : f(x) = -3x² + 3x + 7

To find out the value of f(8) : Substitute 8 in the function in place of x

⇒   f(8) = -3(8)² + 3(8) + 7

⇒   f(8) = -3(64) + 24 + 7

⇒   f(8) = -192 + 24 + 7

⇒   f(8) = -161

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11Alexandr11 [23.1K]
The volume is 288

because V = w h l = 6•4•12 = 288
8 0
3 years ago
Three more than 8 times a number is 29. Find the number.
yanalaym [24]
Well, first off, to solve for this, we can write the expression and then solve from there.
Expression: 8x + 3 = 29
So, now that we have our expression, we can solve for our missing number using the balancing method.
8x + 3 = 29
8x + 3 - 3 = 29 - 3 (we subtracted the three because we needed to get rid of the three on the left side of the equation do now we are just left with 8x = 26.
8x = 26
8x/8 = 26/8. (So, the 8 on the left side cancels out and we are just left with X.
X = 26/8
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So, in conclusion, the answer to this question is: X = 3 and 1/4 as a mixed number or 13/4 as an improper fraction.
Glad I could help!


8 0
3 years ago
4(5x + 9)^2 – 33 = -21
ozzi

Answer:

x = sqrt(3)/5 - 9/5 or x = -9/5 - sqrt(3)/5

Step-by-step explanation by completing the square:

Solve for x over the real numbers:

4 (5 x + 9)^2 - 33 = -21

Add 33 to both sides:

4 (5 x + 9)^2 = 12

Divide both sides by 4:

(5 x + 9)^2 = 3

Take the square root of both sides:

5 x + 9 = sqrt(3) or 5 x + 9 = -sqrt(3)

Subtract 9 from both sides:

5 x = sqrt(3) - 9 or 5 x + 9 = -sqrt(3)

Divide both sides by 5:

x = sqrt(3)/5 - 9/5 or 5 x + 9 = -sqrt(3)

Subtract 9 from both sides:

x = sqrt(3)/5 - 9/5 or 5 x = -9 - sqrt(3)

Divide both sides by 5:

Answer:  x = sqrt(3)/5 - 9/5 or x = -9/5 - sqrt(3)/5

7 0
4 years ago
Read 2 more answers
Determine if the statement is always, sometimes, or never true. Two angles that are vertical are __________ adjacent.
Morgarella [4.7K]

Never true. Vertical angles are equal to each other, not adjacent to each other.

4 0
4 years ago
3x+4y=24 <br> 2x+5y=2<br> Please help me with this problem
Serga [27]

Answer:

x=16

y=-6

Step-by-step explanation:

6 0
3 years ago
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