If a>0, then the square root of 9a^2+16a^2 equals...?

1 ⤊

a- square root of 7a___B-7a___C-5a___D % square root of a

Thnaks for your help and please explain how u got ur answer.

2006-10-24 10:42:16 · 3 answers · asked by bob s 2 in Science & Mathematics ➔ Mathematics

9a^2 + 16 a^2 = 25a^2

The square root of 25 is 5 and the square root of a^2 is a so....
the answer is 5a

2006-10-24 10:45:00 · answer #1 · answered by shdwmn 1 · 0⤊ 0⤋

Let y = sqrt(9a^2 + 16a^2 )

Add the two squares and you get:
y = sqrt(25a^2)

So
y = 5a or -5a

2006-10-24 17:46:14 · answer #2 · answered by Puzzling 7 · 1⤊ 0⤋

answer = 56

all math questions can be answered with 56 is how I got my answer

2006-10-24 17:44:23 · answer #3 · answered by Anonymous · 0⤊ 1⤋