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DedPeter [7]
3 years ago
7

Evaluate the function. f(x) = -x2 – 3x + 15 Find f(-8)

Mathematics
2 answers:
Butoxors [25]3 years ago
6 0

Answer:

f(-8) = -25

Step-by-step explanation:

f(x) = -x^2 - 3x + 15

f(-8) = -[(-8)^2] - 3(-8) + 15

f(-8) = -(64) + 24 + 15

f(-8) = -25

weeeeeb [17]3 years ago
3 0

Answer:

38 baby

Step-by-step explanation:

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5x-4y+-13 and 3x-4y+-11
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5x + -4y = 13

Solving
-5x + -4y = 13

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '4y' to each side of the equation.
-5x + -4y + 4y = 13 + 4y

Combine like terms: -4y + 4y = 0
-5x + 0 = 13 + 4y
-5x = 13 + 4y

Divide each side by '-5'.
x = -2.6 + -0.8y

Simplifying
x = -2.6 + -0.8y
Simplifying
3x + -4y + -11 = 0

Reorder the terms:
-11 + 3x + -4y = 0

Solving
-11 + 3x + -4y = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '11' to each side of the equation.
-11 + 3x + 11 + -4y = 0 + 11

Reorder the terms:
-11 + 11 + 3x + -4y = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 3x + -4y = 0 + 11
3x + -4y = 0 + 11Combine like terms: 0 + 11 = 11
3x + -4y = 11

Add '4y' to each side of the equation.
3x + -4y + 4y = 11 + 4y

Combine like terms: -4y + 4y = 0
3x + 0 = 11 + 4y
3x = 11 + 4y

Divide each side by '3'.
x = 3.666666667 + 1.333333333y

Simplifying
x = 3.666666667 + 1.333333333y
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3 years ago
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