I need help on a few math problems...?

Question

Match them please...

[ ] 9sqrt7+5sqrt2 A. 22sqrt2

[ ] 4sqrt2+6sqrt18 B. 14sqrt7

[ ] 8sqrt63-5sqrt7 C. 20sqrt2-5sqrt3

[ ] 5sqrt48-4sqrt75 D. 0

[ ] 5sqrt2+3sqrt50-sqrt75 E. 19sqrt7

Use the Pythagorean Theorem to determine if the following triangle with sides a, b, & c is a right triangle. Answer Yes or No.

triangle: a=12, b=9, c=15

Yes

No

Use the Pythagorean Theorem to determine if the following triangle with sides a, b, & c is a right triangle. Answer Yes or No.

triangle: a=5, b=10, c=15

Yes

No

Answer 1

* 9sqrt7 + 5sqrt2 => i think is 5sqrt7

= B. 14sqrt7

* 4sqrt2 + 6sqrt18

= 4sqrt2 + 18sqrt2 => A. 22sqrt2

* 8sqrt63 - 5sqrt7

= 24sqrt7 - 5sqrt7 => E. 19sqrt7

* 5sqrt48 - 4sqrt75

= 20sqrt3 - 20sqrt3 => D. 0

* 5sqrt2 + 3sqrt50 - sqrt75

= 5sqrt2 + 15sqrt2 - 5sqrt3 => C. 20sqrt2 - 5sqrt3

* a=12. b=9. c=15

c^2 = a^2 +b^2

225 = 144 + 81

Answer : Yes

* a=5, b=10, c=15

c^2 # a^2 + b^2

Answer : No

Ok.....

Answer 2

i don't have time for this!

Answer 3

1) I think you typed the first one incorrectly. It should be: 9√7 + 5√7. With this correction, the answers are:

[B]

[A]

[E]

[D]

[C]

2) 12² + 9² = 144 + 81 = 225. Since 15 is the square root of 225, the answer is "Yes, this is a right triangle."

3) 5² + 10² = 25 + 100 = 125. Since 15 is NOT the square root of 125, the answer is "No, this is not a right triangle."

Answer 4

4 sqrt(2) + 6 sqrt(18)

4 sqrt(2) + 6 sqrt(2) * 3

4 sqrt(2) + 18 sqrt(2)

22 sqrt(2) - answer A

8 sqrt(63) - 5sqrt(7)

8 *3 * sqrt(7) - 5 sqrt(7)

19 sqrt (7) - answer E

5 sqrt(48) - 4sqrt(75)

5 sqrt(3) sqrt (16) - 4 sqrt (3) * sqrt(25

20 sqrt(3) - 20 sqrt(3)

0 - answer D

5 sqrt(2) + 3 sqrt(50) - sqrt (75)

5sqrt(2) + 15 sqrt(2) - 5 sqrt(3)

20 sqrt2 - 5 sqrt(3) - answer C

The only one left does not make sense, you must have a wrong question, I'm guessing its actually 5sqrt7 instead of sqrt2, this would then match answer B

Pythag theorem says A^2 + B^2 = C^2

12^2 + 9^2 = 15^2

sq rt (12^2 + 9^2) = 15

sq rt (144+ 81) = 15

sq rt (225) = 15

and this is true or Yes

Same method as before

5^2 + 10^2 = 15^2

25 + 100 = 225

No