Final answer:
The provided expression has typographical errors and cannot be directly solved. However, handling expressions with exponents requires applying the power to all components within parentheses. For quadratic equations, the quadratic formula is used to find solutions. The use of correct mathematical procedures is necessary to evaluate expressions and solve equations.
Step-by-step explanation:
To evaluate the expression 20 - 26) ² - 11].2, we must first correct the typos to obtain a valid mathematical expression. Unfortunately, there seems to be a typo in the expression as provided, which makes it difficult to offer a definitive answer. However, I can provide insight on how to handle expressions with parentheses and exponents, and the use of the quadratic formula for quadratic equations.
When an expression within parentheses is raised to a power, it's crucial to remember that the whole content of the parentheses, including any numbers or variables, is affected by the power. For instance, (27x³)(4x²) equals 2.1 × 10-33. It is also important to apply the correct operations in sequence, obeying the order of operations: Parentheses, Exponents, Multiplication/Division (from left to right), and finally, Addition/Subtraction (from left to right).
In the case of quadratic equations of the form at² + bt + c = 0, the solutions can be determined using the quadratic formula. Variations of this equation show up in different problems, and understanding how to apply the quadratic formula to find the values of t that satisfy the equation is crucial for these problems.