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docker41 [41]
2 years ago
11

X2-4x=-4 Solve using quadratic formula (find x)

Mathematics
2 answers:
Amiraneli [1.4K]2 years ago
8 0

Answer:

x=2

Step-by-step explanation:

x^2-4x=-4

x^2-4x+4=-4+4 (Add 4 to both sides)

x^2-4x+4=0

Now, we can solve it using quadratic formula

x_{1,\:2}=\cfrac{-\left(-4\right)\pm \sqrt{\left(-4\right)^2-4* \:1* \:4}}{2* \:1}

x_{1,\:2}=\cfrac{-\left(-4\right)\pm \sqrt{0}}{2* \:1}

x=\cfrac{-\left(-4\right)}{2* \:1}

x=2

~

sergij07 [2.7K]2 years ago
3 0

Add 4 to both sides of the equation.
x^2+4x+ 4 =0

4±√4^2−4⋅(1⋅4)
————————
2⋅1

x= -2
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3 years ago
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3 years ago
A mini-lottery involves selecting 2 numbers between 1 and 10. What is the probability of correctly picking the two numbers?
Igoryamba

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<h3>What is the probability?</h3>

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5 0
2 years ago
Jacki plans to pay for the down payment of a new car with her credit card. The annual interest rate for her credit card is 17%.
AlladinOne [14]

very interesting

the equation we are given is for when the units of t are in years

I do know that you want to have the variable as time, but I'm not sure if you want it in years or months

I will solve for in months because that makes more sense

in that case, it will be 2250(1+r)^m where r=monthly interest rate and m=time in months

to compare, we can do

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and the amount earned should be the same

so therfor we can say

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divide both sides by 2250 to make it easier

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using a calculator

-1+1.01316961=r

<span>0.01316961=r</span>

<span>not sure if yu want percent to thousandth or decimal to thousandth</span>

<span>if decimal then 0.013 is interest rate</span>

<span>if percent then it is 1.317% interest rate</span>

8 0
4 years ago
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