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ira [324]
3 years ago
10

Evaluate each function. 1) f(x) = x2 + 4x; Find f(-7)

Mathematics
1 answer:
katrin [286]3 years ago
5 0

Answer:

The answer is -77

Step-by-step explanation:

Ok, so assuming by x2 you mean x squared, I will solve this. So basically when you have a function, f(-7) would mean that you would have to replace all the x's in the equation with -7. So let's write that out. that would be f(-7) = -7^2 + (-7*4). So now according to PEMDAS, you would solve the exponent first, and -7^2 is equal to -49, because when you solve it you would do -(7^2), which is -(49), which is then -49. So now you have f(-7)= -49+ (4*-7). Solving for (4*-7), you get -28. This leaves you with -49 + (-28), which is -49 - 28. Simplifying that, you get the answer, which is -77.

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This is Josh’s work and solution for the equation x^2-6x-7=0:
inn [45]

Answer:

Step-by-step explanation:

the solution is right

x^2-6x-7=0:

x^2-6x-7=0 (add 7 to both sides)

x^2-6x=7

x^2-6x+9=7+9  (the coefficient of x² will be used to divide all sides)for here its 1, it will remain same ,

then we get the coefficient of x, divide it by 2 and square it and add it to both sides

which is like these

x²-6x=7

the coefficient of x is -6

-6/2 = -3, square it (-3)² = 9

then add 9 to both sides

x^2-6x+9=7+9

simplifiy the squares on the left hand side

x²+9 = (x-3)²

(x-3)^2=16

√(x-3)^2 )=±√16

x-3=± 4

x=-3±4

then simplify each sign

x=-3+4            x=-3-4

x=1                   x=-7

7 0
3 years ago
Read 2 more answers
True/False (4z + y) is the sum of two terms
frutty [35]
True. The answer is the product of 4 and a number plus another number. 
4 0
3 years ago
Read 2 more answers
Simplify x^2-4x+4/x^2-4
MatroZZZ [7]

Answer:

x2 - 4x - 4

 ———————————

    x - 2  

Step-by-step explanation:

4 0
2 years ago
.
stiv31 [10]

Answer:

A

Step-by-step explanation:

Hello There!

The y value of ABC was subtracted by 7 to get to the figure A'B'C'

So the rule for the given transformation would be

(x,y) ---> (x,y-7)

5 0
2 years ago
Which of the following statements demonstrates the associative property of multiplication? 4 ∙ (3 ∙ 6) = (4 ∙ 3) ∙ 6 6 ∙ 4 = 4 ∙
torisob [31]

Answer:

4 ∙ (3 ∙ 6) = (4 ∙ 3) ∙ 6

Step-by-step explanation:

The associative property of multiplication states that rearranging the parentheses in an expression will not change the result, as shown.

6 0
2 years ago
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