Need help to simplify it.

3{-1+4[4-3(-4+5)]}=

Start from the inside parentheses and work your way out.

-4 +5 = 1
That leaves you with
3{-1+4[4-3(1)]}= ___
Then recognize that 3(1) = 3 and 4-3 = 1, so
3{-1+4[4-3(1)]}= 3{-1+4}= ___

Take it from there. What is 3 times 3 ?

answer is 9

To simplify the expression, we need to follow the order of operations or BEDMAS (Brackets, Exponents, Multiplication and Division, Addition, and Subtraction).

Let's break down the expression step by step:

1. Start with the innermost parentheses and evaluate them:
-4 + 5 = 1

2. Replace the simplified parentheses with their value:
3{-1 + 4[4 - 3(1)]}

3. Move on to the next set of parentheses:
3{-1 + 4[4 - 3]}

4. Simplify the brackets inside the square brackets:
3{-1 + 4[1]}

5. Continue simplifying the expression within the curly braces:
3{-1 + 4}

6. Evaluate the addition inside the braces:
3{3}

7. Multiply 3 by the value inside the braces:
3 * 3 = 9

So, the simplified expression is 9.