# college algebra

posted by .

Perform the indicated operation(s) and express the result in standard form. Leave answers in terms of square roots (do not use decimals).
(-9-sqrt-3)^2

• college algebra -

[-9 -sqrt(-3)]^2

let me change that to i notation (i=sqrt-1)

[-9- i sqrt3]^2
Using FOIL
81+9isqsrt3 +9isqrt3+i^2*3
81+18i*sqrt3 -3
78+18i*sqrt3

remember i^2=-1

## Similar Questions

1. ### further mathematics

The roots of the eqn, x^4 + px^3 + qx^2 + rx + s = 0 where p, q, r, s are constants and s does not equal to 0, are a, b, c, d. (i) a^2 + b^2 + c^2 + d^2 = p^2 -2q (in terms of p & q) (ii) 1/a + 1/b + 1/c + 1/d = -r/s (in terms of r …

3. ### math,algebra,help

Directions are simplify by combining like terms. x radiacal 18 -3 radical 8x^2 can someone show me how to do these types of problems. thanks I cant determine the second term. For the first, I think you meant x sqrt(18) which reduces …

I some problems that I need help with please. Add or subtact as indicated and write the results in standard form. 4. 6-(-5+7i)-(7-2i) Divide and express the result in standard form. --These problems I don't understand, do you have …
5. ### Precalculus

Perform the indicated operation and the write the result in standard form (6+ sq root -5)(6 + sq root -7)=
6. ### Algebra

Perform the indicated operations an write the result in standard form. (9+5i)(6-4i)