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2 years ago

5

How can you add and subtract rational expression

2 answers:

Elis [28]2 years ago

8 0

Answer:

who knows what your saying

svp [43]2 years ago

7 0

Answer: add or subtract the numerators and right the result over the common denominator.

When denominators are the same manipulate them so they become the same.

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Convert the following quantities to the indicated units. 57 miles per hour to meters per second

vichka [17]

Answer:

25.481

Step-by-step explanation:

divide by 2.237

8 0

4 years ago

F(x) = -4x2 + 10<br> Find f(-2)

Veronika [31]

Answer:

f(-2) = -6

Step-by-step explanation:

In the expression, to get f(-2);

we simply substitute the value of x with -2

We have this as;

f(-2) = -4(-2)^2 + 10

f(-2) = -4(4) + 10

f(-2) = -16 + 10

f(-2) = -6

3 0

3 years ago

PLEASE PLEASE PLEASE HELP ME ANSWER THIS QUESTION QUICK!! The picture of the question is down below.

d1i1m1o1n [39]

Answer:

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Step-by-step explanation:

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4 0

3 years ago

PLEASE HELP HURRY!!!!!!!

Charra [1.4K]

As it has been given that $x=4+5i$ , $y=2-9i$ .

We need to find the value of the following:

(i) $4x-y$ , substituting the value of 'x' and 'y' in the expression, we get:

$4(4+5i)-(2-9i)=4\times 4+4\times 5i-2+9i=16+20i-2+9i$

$=14+29i$

So, $4x-y=14+29i$

(ii) $-x+3y$ , substituting the value of 'x' and 'y' in the expression, we get:

$-(4+5i)+3(2-9i)=-4-5i+3\times 2-3 \times 9i=-4-5i+6-27i$

$=2-32i$

So, $-x+3y=2-32i$

(iii) $x \times y$ , we need to substitute the value of 'x' and 'y' in the expression, for this, we can use distributive property of multiplication that says,

$a(b+c)=a \times b+ a \times c$

Using the distributive property of multiplication:

$(4+5i)\times(2-9i)=4 \times 2-4 \times 9i+5i \times 2-5i \times 9i$

$=8-36i+10i-45i^2$

Now, we know that $i \times i=i^2=-1$

We get, $8-36i+10i-45 \times (-1)=8-26i+45$

$=8+45-26i=53-26i$

Therefore, $x \times y$ = $53-26i$ .

(iv) We have, $2x \times y$ , we need to substitute the value of 'x' and 'y' in the expression, we get:

$2(4+5i)\times (2-9i)$

Again, we can use distributive property of multiplication that says,

$a(b+c)=a \times b+ a \times c$

So,

$2(4+5i) \times (2-9i)=2\times 4+2 \times 5i\times(2-9i)$

$=8+10i \times(2-9i)=8\times 2-8 \times 9i+10i \times 2-10i \times 9i$

$=16-72i+20i-90i^2$

since, $i^2=-1$

we get,

$16-72i+20i-90 \times (-1)=16-52i+90$

$=106-52i$

Therefore,

$2x \times y=106-52i$

7 0

4 years ago

Read 2 more answers

For the equation, 2x + 6 = 3x - 10, what is the solution

geniusboy [140]

Answer: x=16

Step-by-step explanation:

$2x+6=3x-10$

Subtract 6 on both sides

$2x+6-6=3x-10-6$

$2x=3x-16$

Subtract 3x on both sides

$2x-3x=3x-16-3x$

$-x=-16$

Divide -1 on both sides

$\frac{-x}{-1}=\frac{-16}{-1}$

$x=16$

7 0

3 years ago