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radical 32- 7 radical 2 pls help i dont know how to do this

#1
+4710
+5

First, simplify the square root of 32.

$$\sqrt{32}-7\sqrt2\\~\\ =\sqrt{2\cdot2\cdot2\cdot2\cdot2}-7\sqrt2 \\~\\ =\sqrt{2\cdot2}\cdot\sqrt{2\cdot2}\cdot\sqrt2-7\sqrt2 \\~\\ =2\cdot2\cdot\sqrt2-7\sqrt2 \\~\\ =4\sqrt2-7\sqrt2$$

$$4\sqrt2-7\sqrt2=-3\sqrt2$$

So..the most simplified form is:      $$-3\sqrt2$$

hectictar  May 4, 2017
Sort:

#1
+4710
+5

First, simplify the square root of 32.

$$\sqrt{32}-7\sqrt2\\~\\ =\sqrt{2\cdot2\cdot2\cdot2\cdot2}-7\sqrt2 \\~\\ =\sqrt{2\cdot2}\cdot\sqrt{2\cdot2}\cdot\sqrt2-7\sqrt2 \\~\\ =2\cdot2\cdot\sqrt2-7\sqrt2 \\~\\ =4\sqrt2-7\sqrt2$$

$$4\sqrt2-7\sqrt2=-3\sqrt2$$

So..the most simplified form is:      $$-3\sqrt2$$

hectictar  May 4, 2017
#2
+50
+2

thanks that helped alot

also how you get the radical sign

#3
+4710
+4

I did it using the LaTeX button right next to the image button...

Erase the stuff that is already inside and then click the " Math " button in the top left. At the bottom of the list there is a little picture of a square root. You can just click that and then type the number that you want to go underneath between the {} s.

Also..you can copy and pase this: √[   ]

And just type what goes under between the parenthesees :)

Or.....you can just type sqrt(  )

hectictar  May 4, 2017
#4
+50
+2

thx

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