Awind turbine at a wind farm generates 1.5 megawatts of power. the total power generated by all the turbines on the wind farm is 1.5x – 3, where x is the number of turbines. if the total power from all the turbines is 69 megawatts, which number from the set {45, 46, 47, 48, 49} is the correct value of x?

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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.