Question

Quick question:
sqrt100y + sqrt25y - sqrt64y
sqrt100= 10
sqrt25= 5
sqrt 64 = 8
sqrt(y) +sqrt(y) -sqrt(y)

When it comes to adding square roots of variables.. what's the rule?
I forgot & I can't go back in the lesson without losing my current answers.

Answer 1

When it comes to adding square roots of variables?? here you have perfect squares so just add the roots

Answer 2

\[10\sqrt y + 5 \sqrt y -8 \sqrt y = \]
add them as you would any variables, pull a common factor... \[10\sqrt y + 5 \sqrt y -8 \sqrt y = (10 +5 -8) \sqrt y\]