Question

PLEASE HELP!

What is the product of Seven square root eight times four square root five? Simplify your answer.

Answer 1

Twenty eight radical ten
Fifty six radical two
Fifty six radical ten
Two hundred eighty radical four

Answer 2

Is this the problem \( \huge 7\sqrt{8} \times 4\sqrt{5} \) ??

Answer 3

yes there both is inside ( )

Answer 4

What one do you think is the correct answer?

Answer 5

A

Answer 6

It is C

Answer 7

What did you multiply

Answer 8

You multiply the 7 * 4 = 28 then you multiply \( \huge \sqrt{8} * \sqrt{5} = \sqrt{40} \)

Also quick note, this symbol * means to times

Now we have \( \huge 28 * \sqrt{40} \) but we need to break down the \( \huge \sqrt{40} \) and we can do that by finding a perfect square and a non perfect square and then timing them together. A perfect square would be \( \huge \sqrt{4} = 2 \) and a non perfect square would be \( \huge \sqrt{10} \) Now notice that \( \huge 28 * \sqrt{4} * \sqrt{10} = \sqrt{40} \) so we are still using \( \huge \sqrt{40}\) but we have just changed its form.

So now we have \( \huge 28 * \sqrt{4} * \sqrt{10} = 2\sqrt{10} \)
Now we take
\( \huge 2\sqrt{10} \) and times it by 28 so we have

\( \huge 28 * 2\sqrt{10} = 56\sqrt{10}\)

Answer 9

oh ok