Recall that the product (a + b)(a - b) is the difference of squares, a2 - b2
Examine this same product for radical
expressions. Choose the product of (3+ square root of 7)(3- square root of 7)

The third option (9+--)

Step-by-step explanation:

With FOIL, this can be expanded. (a+b)(a-b) is equal to a²+ab-ab-b² or a²-b².

In this case, all the answers have 4 terms, so we want the first option. This makes the equation 3²+(3×)-(3×)-()².

Solving these gives 9+--7. This is the same as  9+--.

**This content involves multiplying with surds and expanding perfect squares, which you may wish to revise. I'm always happy to help!

sorry can't

step-by-step explanation:

i googled though and something came up but it was in science langueage not common english sooo

i believe it is 0.1m because the measurement of 30.4m limits how precise you can be

you can only be as precise as the least precise measurement