2 years ago

If xy=15 and x+y=5, find x^2+y^2

Mathematics

1 answer:

lora16 [44]2 years ago

8 0

Answer:

- 5

Step-by-step explanation:

Note that

(x + y)² = x² + 2xy + y², thus

x² + y² = (x + y)² - 2xy ← substitute given values

= 5² - 2(15)

= 25 - 30

= - 5

You might be interested in

Mr. Chase is having a party for his teachers. If the pizzeria cuts their pies into eight slices and each teacher is eating 1/8 o

Ivanshal [37]

6 pies.

If 8 teachers finish one whole pie, and they need to feed 47, then they need 6 pies with 8 slices each aka 48 slices total, there will be one slice leftover for the principal :D

6 0

1 year ago

4.2×10 to the negative 2 power divided by 2×10 to the 2nd power

xxTIMURxx [149]

8.4 is the answer i believe

6 0

3 years ago

Read 2 more answers

Plzzz help i need A.S.A.P

Vladimir79 [104]

Hope this helps you. :)

3 0

3 years ago

Read 2 more answers

Whats the circumference of a circle with a radius of 21 meters

Bogdan [553]

Answer:

C =131.88 meters

Step-by-step explanation:

The circumference of a circle is given by

C = 2*pi*r

where r is the radius

C = 2 * pi * 21

C = 42 pi

If we approximate pi by 3.14

C = 42(3.14)

C =131.88 meters

7 0

2 years ago

Read 2 more answers

It's in the attachment <br> URGENT

maxonik [38]

Step-by-step explanation:

$\frac{2a}{a + b - c} = \frac{2b}{b + c - a} = \frac{2c}{a + c - b} = k \\ \\ by \: theorem \: on \: equal \: ratios \\ \\ \frac{2a + 2b + 2c}{a + b - c + b + c - a + a + c - b} = k \\ \\ \frac{2(a + b + c)}{a + b + c} = k \\ \\ \therefore \: k = 2$

5 0

3 years ago