Question

HELP ASAP PLEASEE!! Simplify the sum or difference: 4√2-7√

Answer 1

$4\sqrt{2} - 7 \sqrt{2} = - 3 \sqrt{2}$
First question answer is B.
$3 \sqrt{7} - \sqrt{63} = \sqrt{63} - \sqrt{63} = 0$
Second question answer is D.

3^2 = 9, 7 x 9 =63
**In case you're wondering why 3 square root 7 equals to square root 63.

Hope this helps.

Answer 2

Answer:

1. Option b is correct, $-3\sqrt{2}$

2. option d is correct; 0

Step-by-step explanation:

1. Simplify the sum or difference:

$4\sqrt{2} - 7\sqrt{2}$

then, the result we get;

$-3\sqrt{2}$

Therefore, the difference of $4\sqrt{2} - 7\sqrt{2}$ is, $-3\sqrt{2}$

2.

Simplify the sum or difference:

$3\sqrt{7} - \sqrt{63}$

We can write $\sqrt{63}$ as:

$\sqrt{63} = \sqrt{9 \cdot 7} = \sqrt{3^2 \cdot 7} =3\sqrt{7}$

then;

$3\sqrt{7} -\sqrt{63} = 3\sqrt{7}-3\sqrt{7} = 0$

Therefore, the difference of $3\sqrt{7} - \sqrt{63}$ is, 0