3 years ago

Which expression DOES NOT represent a square root of a perfect integer

1 answer:

5 0

The answer is D) square root of 89

Explanation:
Since it's asking for a root with a perfect integer, you need to multiply a whole number by itself, answer choice D is the only one that doesn't achieve this.

A- sq rt of 100 is 10
B- sq rt of 64 is 8
C- sq rt of 81 is 9

You might be interested in

Help please; I need the right answer

Ad libitum [116K]

Answer:

Step-by-step explanation:

$\cos x+\sqrt{2}=-\cos x \\ 2\cos x = -\sqrt 2 \\ \cos x = -\dfrac{\sqrt 2}{2}\\ \\ \Rightarrow x = \pm \arccos\Big(-\dfrac{\sqrt 2}{2}\Big)+2k\pi,\quad x\in \mathbb{Z}\\ \Rightarrow x =\pm\dfrac{3\pi}{4}+2k\pi\\ \\ \\k = -1 \Rightarrow x < 0\\\\ k=0 \Rightarrow x 2\pi$