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qaws [65]
3 years ago
9

What is the value of 8x + 2x when x = 6?

Mathematics
2 answers:
ella [17]3 years ago
7 0
8x + 2x

Plug the variable in.

8×6 + 2×6

48+12 = 60
Lelechka [254]3 years ago
7 0
The value is 96 because 8 times 6 is 48 and 2 times 6 is 12.Then you add it together and you will get 96
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Answer:

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Solve x2 + 8x = 33 by completing the square. Which is the solution set of the equation? {–11, 3} {–3, 11} {–4, 4} {–7, 7}
HACTEHA [7]
ANSWER
x =   - 11\: or \: x =  3



EXPLANATION

The quadratic equation given to us is

{x}^{2}  + 8x = 33


We add half the square of the coefficient of
x
to both sides of the equation to obtain,

{x}^{2} + 8x +  {(4)}^{2}  = 33 +  {(4)}^{2}


This implies that,
{x}^{2} + 8x +  {(4)}^{2}  = 33 + 16

The right hand side simplifies to

{x}^{2} + 8x +  {(4)}^{2}  = 49


The left hand side is a perfect square.

This gives us


{(x + 4)}^{2}  = 49

We take the square root of both sides


x + 4 =  \pm \sqrt{49}

This evaluates to

x + 4 =  \pm 7


We make x the subject.


x =   - 4\pm 7

We now split the square root sign to get



.

x =   - 4 - 7 \: or \: x =  - 4 + 7


x =   - 11\: or \: x =  3

The correct answer is A.
7 0
3 years ago
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