Final answer:
With the provided information, we cannot evaluate the expression accurately for x = 3 and y = 4. The related references to a quadratic equation and the quadratic formula do not apply to the original values given without the complete expression or additional context.
Step-by-step explanation:
The provided information does not clearly indicate what expression needs to be evaluated with x = 3 and y = 4, nor does it give a complete quadratic equation to apply the quadratic formula. For the expression dx²-y², if we assume d to be a constant, and we use the given values of x and y, the expression simplifies to:
d(3)² - (4)²
9d - 16
The value of this expression cannot be determined without knowing the value of d. Furthermore, none of the given options a) – 9⁄4, b) – 3⁄4, c) – 9⁄16 or d) – 3⁄2 are relevant without additional context or the complete expression to evaluate.
Moreover, the reference to the quadratic formula and the coefficients a = 4.90, b = 14.3, and c = -20.0 is not directly connected to solving the expression given the values of x and y.
Therefore, without additional information or clarification, we cannot evaluate the expression accurately.