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2 years ago

Expand and simplify. 2x(x + 4)

Mathematics

2 answers:

Anit [1.1K]2 years ago

6 0

Hello there! 2x² + 8x.

2x(x + 4) > start by multiplying 2x by both terms in the equation.

so, 2x(x + 4) is the same as 2x(x) + 2x(4).

We are left with 2x² + 8x.

We cannot simplify this anymore, so this is your final answer. :)

Veronika [31]2 years ago

4 0

Answer: 2xsquared + 8x (sorry i cant do the squared symbol on my phone)

Explanation : you need to multiply out the brackets so if you have 2 xs and you are multiply with brackets they then become x squared as there is 2 of them. You get 8x as when you times 2 by 4 you get 8 and as you already have an x there it would have to be 8x. Hope this helps!

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2 years ago

Using the quadratic formula to solve x2 + 20 = 2x, what are the values of x?

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by Quadratic formula , $x^2 + 20 = 2x$ , values of x are $x = 1 \pm (1)i\sqrt{19}}$ . None of mentioned options are correct according to question!

Step-by-step explanation:

Here we have , expression x2 + 20 = 2x or , $x^2 + 20 = 2x$ .

We know that Quadratic formula is :

$x = \frac{-b \pm \sqrt{b^{2}-4ac}}{2a}$

$x^2 + 20 = 2x$

⇒ $x^2-2x+20=0$

$a=1\\b=-2\\c=20$

Putting this value in equation $x = \frac{-b \pm \sqrt{b^{2}-4ac}}{2a}$ :

⇒ $x = \frac{-b \pm \sqrt{b^{2}-4ac}}{2a}$

⇒ $x = \frac{-(-2) \pm \sqrt{(-2)^{2}-4(1)(20)}}{2(1)}$

⇒ $x = \frac{2 \pm \sqrt{4-80}}{2}$

⇒ $x = (\frac{2 \pm 2i\sqrt{19}}{2})$

⇒ $x = 1 \pm (1)i\sqrt{19}}$

Therefore , by Quadratic formula , $x^2 + 20 = 2x$ , values of x are $x = 1 \pm (1)i\sqrt{19}}$ . None of mentioned options are correct according to question!

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