(sqrt3 + 5)(sqrt3 -3) ?

multiply that out
sqrt3*sqrt3 -3sqrt3 +5sqrt3 -15
now combine and simplify terms.

yes the problems is:

((sqrt3)+5)((sqrt3)-3)
if i put in my calculator what the squareroot of 3 it will give me 1.7

so if i it by decimals i get the follwoing

2.89-5.1+8.5-15 is this right becuase i need to do foil for it correct or no.

NNNNOOOO. don't put it in the calculator.

multiply that out
sqrt3*sqrt3 -3sqrt3 +5sqrt3 -15
now combine and simplify terms.

sqrt3*sqrt3 is 3. The two middle terms add to 2sqrt3
So the answer is 2sqrt3 -12.

To simplify the expression ((sqrt3)+5)((sqrt3)-3), you can use the FOIL method. Replace the brackets with parentheses and follow these steps:

1. Multiply the first terms: (sqrt3) * (sqrt3) = 3.

2. Multiply the outer terms: (sqrt3) * (-3) = -3sqrt3.

3. Multiply the inner terms: 5 * (sqrt3) = 5sqrt3.

4. Multiply the last terms: 5 * (-3) = -15.

Now, combine the terms:

3 - 3sqrt3 + 5sqrt3 - 15.

Next, combine like terms:

(3 - 15) + (-3sqrt3 + 5sqrt3).

This simplifies to:

-12 + 2sqrt3.

So, the final answer is -12 + 2sqrt3.