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3 years ago

20 % of 2 is equal to A. 20 B. 4 C. 0.4 D. 0.04

Mathematics

1 answer:

ExtremeBDS [4]3 years ago

4 0

I think the answer is 0.4

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Find the value of x² - x+1 when x=√3 -1, in the form a+b√3 where a and b are integers

lidiya [134]

Answer:

$6-3\sqrt{3}$

If you compare this to $a+b\sqrt{3}$ , then $a=6$ and $b=-3$ .

Step-by-step explanation:

We are given $x=\sqrt{3}-1$ and we are asked to find the value of $x^2-x+1$ .

So we will need to find $x^2$ .

$x=\sqrt{3}-1$

Square both sides:

$x^2=(\sqrt{3}-1)^2$

Expand using identity: $(x-a)^2=x^2-2ax+a^2$ .

$x^2=(\sqrt{3})^2-2(\sqrt{3})(1)+1^2$

$x^2=3-2\sqrt{3}+1$

$x^2=4-2\sqrt{3}$

Let's go back to the full $x^2-x+1$ .

$x^2-x+1$

$(4-2\sqrt{3})-(\sqrt{3}-1)+1$

$4-2\sqrt{3}-\sqrt{3}+1+1$

$6-3\sqrt{3}$

If you compare this to $a+b\sqrt{3}$ , then $a=6$ and $b=-3$ .

5 0

3 years ago

Which quadratic equation is equivalent to (x + 2)^2 + 5(x + 2) - 6 = 0?

Ber [7]

Answer:

$x^2$ + 9x + 8 = 0

Step-by-step explanation:

First, we have to simplify this quadratic equation:

(x+2)^2 + 5(x+2) - 6 = 0

x^2 + 4x + 4 + 5x + 10 - 6 = 0

x^2 + 9x + 8 = 0

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1 year ago

If 4C + 3 = 15, what is the value of C?

Soloha48 [4]

4c+3=15
You need to get rid of the 3
So you minus it from each side so you
4c=12
12/4=3
So c =3

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Tasya [4]

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yan po sagot ko Hindi ko po alam kung tama o Hindi basta yan po sagot ko...

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2 years ago

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0.6x + 3 = 0.1x - 7 what value of x makes the question true

svetlana [45]

Answer:x=-20

Step-by-step explanation:

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3 years ago