Week 4 blog post

Posted on September 30, 2018 by saejino2016

Reply

Sum this expression

$3\sqrt{5}$ + $4\sqrt{7}$ = $3\sqrt{5}$ + $4\sqrt{7}$

It can not be added, because it is same with x, y. Like 3x+4y. So it can not be added.

Sum this expression

$2\sqrt{3}$ + $6\sqrt{11}$ – $\sqrt{3}$ + $13\sqrt{11}$ = $\sqrt{3}$ + $19\sqrt{11}$

simplify this expression

( $3\sqrt{7}$ )( $2\sqrt{3}$ + $7\sqrt{13}$ ) = $6\sqrt{21}$ + $21\sqrt{91}$

On this chapter, I learned, the number in the root is same, it can be added and subtracted. But multiplication is possible to multiple that the number in root is not same. Also I learned new words. Like index, radicand, and radical.

$10\sqrt{15}$ In this root, index is 10, radicand is 15, and they are called radical.

Week 3 blog post

Posted on September 25, 2018 by saejino2016

Reply

Arrange in order from greatest to least.

$2\sqrt{10}$ , 8, $3\sqrt{7}$ , $4\sqrt{3}$ , $5\sqrt{2}$ , $2\sqrt{13}$

These are mixed radical, So I will changed to entire radical to compare easily.

$\sqrt{40}$ , $\sqrt{64}$ , $\sqrt{63}$ , $\sqrt{48}$ , $\sqrt{50}$ , $\sqrt{52}$

These are more easily to compare which one is bigger or less.

Arrange. 8, $3\sqrt{7}$ , $2\sqrt{13}$ , $5\sqrt{2}$ , $4\sqrt{3}$ , $2\sqrt{10}$

Because of this chapter, I completely understand about root.