47.
Multiply and simplify if possible.
(problem below)

Question

47.  
Multiply and simplify if possible.
(problem below)

anonymous · Answer

$$\sqrt{7x}(\sqrt{x}-7\sqrt{7})$$

anonymous · Answer

@AravindG

zehanz · Answer

Use the distributive property: a(b-c)=ab-ac, so:$$\sqrt{7x}\sqrt{x}-\sqrt{7x}7\sqrt{7}=...$$

anonymous · Answer

idk how to solve it i got a decimal when i used the calculator.

zehanz · Answer

Just multiply as follows: √a√b=√(ab), so:

√(7x)√x=√(7x²) and
√(7x)7√7=7√(49x)

So you now have :√(7x²) - 7√(49x)

Both these terms can be simplified a little more, but do not use the calculator!

anonymous · Answer

so would $$\sqrt{7x^3}=\sqrt{49}$$
be the answer???

anonymous · Answer

xsqrt7-7sqrtx  is the answer right?

zehanz · Answer

No, you cannot subtract these different terms.
Your last answer is almost right!

√(7x²)=√7√x²=x√7
7√(49x)=7√49√x=7*7√x=49√x

Final answer: x√7-49√x