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3 years ago

How to do 13-4x=1-x also show all steps?

1 answer:

3 0

Given :13-4x=1-x
Solution :
-4x+x=1-13 ( transfer -x to right side and change the sign from - to + ,the number 13 also when we transfer to the
left side you must change the sign from + to - ,then add of the the same sign the different sign
minus the bigger number will carry the sign)
-3x=-12
-3x/-3 = -12/-3 ( in order to get the x you divide the same number and sign both sides)
X = 4 answer

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yarga [219]

Because this is a fourth degree that will be tricky to factor as it is, we will do a u substitution. Let $x^2=u$ . We can now rewrite that polynomial in terms of u: $u^2-7u-8=0$ . Filling into the quadratic formula we have $u=\frac{7+/-\sqrt{49-4(1)(-8)}}{2}$ . Simplifying down $u=\frac{7+/-\sqrt{81}}{2}$ and $u=\frac{7+9}{2}$ or $u=\frac{7-9}{2}$ . That means that u = 8 or u = -1. But don't forget that we let $u=x^2$ , so we have to put x-squared back in for u. That gives us $x^2=8$ which simplifies down to $+/-2\sqrt{2}$ . That also gives us $x^2=-1$ . When we take the square root of -1, we have to use the fact that -1 = i^2, so we sub that in to get $x=+/-i$ . All in all, your solutions are as follows: $2\sqrt{2},-2\sqrt{2},i,-i$ which is choice b.

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3 years ago

Need help on this one

ivolga24 [154]

If a triangle has side lengths 5, 5, and 8, then the triangle should be classified as isosceles.

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3 years ago

Please help me find what ? Is

kotegsom [21]

Answer:

My answer is 43 its that rigth

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3 years ago

The value of πPhone stock has increased 9% each year for the past several years. In 2020, the stock was worth $75. What will the

Iteru [2.4K]

Answer:

2027 = $122.25

2016 = $48

Step-by-step explanation:

Find 1% of 75

75 / 100 = 0.75

multiply by 9

0.75 * 9 = 6.75

So that's $6.75 each year

Now, lets find our answers for 7 years.

6.75 * 7 = $47.25

75 + 47.25 = $122.25

The stock will be $122.25 in 2027

Now for 2016.

$6.75 * 4 = $27

$75 - $27 = $48

The stock was $48 in 2016

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3 years ago

Mitchell drew 56 pictures. Rafi drew p fewer pictures than Mitchell. Write an expression that shows how many pictures Rafi drew.

Angelina_Jolie [31]

This would be 56 - p because 'fewer' indicates subtraction.

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3 years ago