Mathematics, 19.06.2020 02:57 Winechou

Solve x2 + 4x – 4 = 0

Answers: 3

Show answers

Answers

Answer from: afridi5250

Quadratic Equations! Yes!

Step-by-step explanation:

Now, there are three methods to solving this:

1.Quadratic Formula

2.Factoring

3. Completing the square

Now, Based on the answers, I think it would be better if we used Quadratic Formula, as you cannot get the answer easily with factoring, and I'm a bit rusty on completing the square.

So, Quadratic Formula! To solve it using this method, we have to find x using this: $x=\frac{-b+-\sqrt{b^{2} -4ac} }{2a}$ (the +- before the square root means it could be both positive or negative)

Where a, b are coefficients and c is a term(in a quadratic equation form: $ax^{2} +bx+c=0$ )

So, we just have to input the stuff from our equation into the formula!

$x=\frac{-4+-\sqrt{32} }{2}$

Now, we can simplify the square root of 32 into 4 times the square root of 2

$x=\frac{-4+-4\sqrt{2} }{2}$

And, we can divide 2 from it all!

$x=-2+-2\sqrt{2}$

So, there you have it! The Answer is C, or 3.

Hope this helps!

Answer from: Quest

a) one student is chosen from classroom a, then a student is chosen from classroom b.

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b. this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes. this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes. this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes. this makes them dependent events.

Answer from: Quest

really really sorry if i'm

-12 -5(x + 4) = 3x

-12 - 5x - 20 = 3x

-12 - 20 - 5x = 3x

-32 - 5x = 3x

+ 5x + 5x

-32 = 8x

8 8

- 4= x

Can someone plz solve this question for me? ? i will give

Another question on Mathematics

Mathematics, 21.06.2019 17:30

If you apply the below transformations to the square root parent function, f(x) = vx, what is the equation of the new function? • shift 12 units right. • shift seven units down.

Answers: 1

Answer

Mathematics, 21.06.2019 20:00

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.

Answers: 1

Answer

Mathematics, 21.06.2019 20:30

Secant ac and bd intersect at point e inside f what is the measure of aed if measurements cd equals 30 a b is 50 and cb is 170

Answers: 1

Answer

Mathematics, 21.06.2019 21:00

Which expression is equal to (21)(7)(3x) using the associative property? (21 · 7 · 3)x (7)(21)(3x) 32(7 + 3x) (3x)(7)(21)

Answers: 2

Answer

You know the right answer?

Solve x2 + 4x – 4 = 0
...