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3 years ago

Hi! i’ll give brainliest please help

Mathematics

1 answer:

Firlakuza [10]3 years ago

4 0

Answer:

Is it deposition

Step-by-step explanation:

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3x-2y=14 y=5x Solve by substitution

irina [24]

3x - 10x = 14

-7x = 14

x = -2

5 0

3 years ago

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Maurinko [17]

Answer:

The factorization of given expression $x^2 + 81$ is (x + 9i)(x – 9i) and option d is correct.

Solution:

Given, expression is $x^2 + 81$

We have to factor it in the complex numbers.

Let us check options to find answer.

A) (x – 9)(x – 9)

(x – 9)( x – 9) $=(x-9)^{2}=x^{2}-18 x+81$

So, this is not correct answer.

B) (x + 9)(x + 9)

$(x+9)(x+9)=(x+9)^{2}=x^{2}+18 x+81$

So, this is not correct answer.

C) (x + 9i)(x + 9i)

$(x+9 i)(x+9 i)=(x+9 i)^{2}=x^{2}+18 x i+81(-1)=x^{2}+18 x i-81$

So, this is not correct answer.

D) (x + 9i)(x - 9i)

$(x+9 i)(x-9 i)=x^{2}-(9 i)^{2}=x^{2}-(-81)=x^{2}+81$

Thus option D is correct

Hence, the factorization of given expression is (x + 9i)(x – 9i). and option d is correct.

3 0

3 years ago

What is the value of the product (3 - 2i(3 + 2i?

ZanzabumX [31]

Answer:

i is always positive

Step-by-step explanation:

if be multiply 3 by 3 and get 9, then you multiply -2i by 2i and get -4i squared

9-4i^2 is now easy to solve unless we do now know the value of i, but since i is squared, i is always positive

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3 years ago

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ALGEBRA 15 POINTS please help will give 15 points

Licemer1 [7]

Answer:

angle FEX is 105

Step-by-step explanation:

x=30 just plug that in and check(i already did but if u want to u can do it too).

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3 years ago

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What is 0.0000000345 in scientific notation?

spin [16.1K]

Since the number is less that 1, the exponent will be a negative.
3.45X10^-8

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3 years ago