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2 years ago

HELP PLEASEE! but which one do you think it is? (1,2,3,4)

Mathematics

1 answer:

Virty [35]2 years ago

8 0

Answer:

Step-by-step explanation:

I'm not sure though. Guess if you have to.

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Which expression is a difference of squares with a factor of 2x5?

Sedbober [7]

Answer:

${( \sqrt{3.5} })^{2} - {( \sqrt{1.5} )}^{2}$

Step-by-step explanation:

The difference of two squares identity is

${x}^{2} - {y}^{2} = (x - y)(x + y)$

When we let

$\sqrt{3.5}$

and

$\sqrt{1.5}$

, we get:

${( \sqrt{3.5} )}^{2} - {( \sqrt{1.5}) }^{2} = (3.5 - 1.5)(3.5 + 1.5)$

This will simplify to give us the required factors

${( \sqrt{3.5} )}^{2} - {( \sqrt{1.5}) }^{2} =2 \times 5$

7 0

3 years ago

What is the other square root of 119 + 120i?

MakcuM [25]

Answer:

$\sqrt{119+120 i}=\pm (12.24+i 4.90)$

Step-by-step explanation:

Given

z = 119 + 120 i

Let $\sqrt{119+120 i}=p+iq$

Squaring both sides

$119+120 i=p^2-q^2+2ipq$

Comparing real and imaginary part

Re(LHS)=Re(RHS)

$119=p^2-q^2$ ...........................(1)

comparing Im(LHS)=Im(RHS)

120=2pq

$q=\frac{60}{p}$

Substitute q in 1

$119=p^2-(\frac{60}{p})^2$

$p^4-119p^2-(68)^2=0$

Let $x=p^2$

$x^2-119x-4624=0$

$x=\dfrac{119\pm \sqrt{119^2+4\times 4624}}{2}$

$x=\frac{119\pm 180.71}{2}$

we take only Positive value because $p^2=x$

x=149.85

$p^2=149.85$

thus $p=\pm 12.24$

$q=\pm 4.90$

thus,

$\sqrt{119+120 i}=\pm (12.24+i 4.90)$

8 0

2 years ago

There was an iPhone with a price of $1,999 at best buy. It was 40% off. What was the price of the phone without tax?

andriy [413]

Answer:

799.60

Step-by-step explanation:

4 0

2 years ago

The range of y = Arcsin x

taurus [48]

Answer:

This variant of a sine function, reduced to an interval where it is monotonous and fills an entire range, has an inverse function called y=arcsin(x) . It has range [−π2,π2] and domain from −1 to 1 .

Step-by-step explanation:

hope that answers ur question :)

8 0

3 years ago

Hi! Please help me and explain!

Orlov [11]

Distance formula sqrt((x2-x1)^2 + (y2-y1)^2))

Sqrt((4-2)^2+(-7+3)^2)

Sqrt(2^2+4^2)

Sqrt(4+16)

Sqrt(20)

2sqrt5.

The second choice is the correct answer.

3 0

2 years ago