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Sergeeva-Olga [200]
3 years ago
11

Answer this: x=6 y=-2 -8x-4y+x

Mathematics
2 answers:
olga55 [171]3 years ago
7 0

Answer:

-34

Step-by-step explanation:

first do substitution: -8 · 6 + -4 · -2 + 6

next do the multiplication: -48 + 8 + 6

add: -34

hope this helps!!!

Natali [406]3 years ago
4 0

Answer:

-34

Steps:

-8x - 4y + x

-8x + x = -7x <em>(combine like terms)</em>

-7x - 4y

-7(6) - 4(-2) <em>(plug in the numbers)</em>

-42 +8=

-34

:")

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It is asking you to find the sum of k^2 - 1 from k=1 to k=4. Since that is only 4 numbers, calculating the sum by hand wouldn’t be that bad.

(1^2 - 1) + (2^2 - 1) + (3^2 - 1) + (4^2 - 1) = 26

The easier way to find the sum is to use a few simple formulas.

When we have a term that is just a constant c, the formula is c*n.

When we have a variable k, the formula is k*n*(n+1)/2.

When we have a squared variable, the formula is k*n*(n+1)*(2n+1)/6.

In this case, we have a squared variable k^2 and a constant of -1.

So plug in n=4 to the formulas:

4*5*9/6 - 1*4 = 26

The answer is 26







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