Which expression is equivalent to (2x – 3)2 – 3.5x2(2x –5) + 6x(2.5x2 – x + 3.1)?
8x3 + 15.5x2 + 18.6x + 9
8x3 + 15.5x2 + 6.6x + 9
8x3 + 15.5x2 – 12x + 27.6
8x3 – 19.5x2 – 12x + 27.6

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.