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(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.

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