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2 years ago

Given the function f(x) = -2x2 + 4x - 7, find f(-4). -55 -7 25

Mathematics

2 answers:

Neko [114]2 years ago

7 0

Answer:

f(-4)= -55

Step-by-step explanation:

We want to find f(x), or y, when x is equal to -4.

Therefore, we can substitute -4 in for x in the function.

f(x) = -2x^2 + 4x - 7

Substitute -4 in for x

f(-4) = -2(-4^2) + 4(-4) - 7

Evaluate the exponent

f(-4)=-2(16)+4(-4)-7

Multiply -2 and 16

f(-4)= -32+4(-4)-7

Multiply 4 and -4

f(-4)=-32-16-7

Subtract

f(-4)=-55

DaniilM [7]2 years ago

6 0

-2(-4)2+4(-4)-7
16-16-7
-7. -7 is correct

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and use this to show it holds for $n=k+1$ , i.e.

$8+16+\cdots+8(k-1)+8k+8(k+1)=4(k+1)(k+2)$

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2 years ago

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Step-by-step explanation:

We know that the possible values of X (all with the same probability) are:

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