(-8 radical x + radical y) ( radical x+8 radical y)?

Question

what are the steps

Answer 1

for what????
(-8 radical x + radical y) ( radical x+8 radical y)
= ( -8 sqrt(x) + sqrt(y) ) (sqrt(x) +8sqrt(y) )
=-8 x -64sqrt(x)sqrt(y) +sqrt(x)sqrt(y) + 8 y
= -8 x -63sqrt(x)sqrt(y) + 8 y .

Answer 2

I assume you want to multiply it out. Use the FOIL method.
Multiply the:

First terms
Outside terms
Inside terms
Last terms

(-8√x + √y)(√x + 8√y)
= (-8√x)(√x) + (-8√x)(8√y) + (√y)(√x) + (√y)(8√y)
= -8x - 64√(xy) + √(xy) + 8y
= -8x - 63√(xy) + 8y