Question

30а-5(а+3)² при а=2

Answer 1

держи решение.лень печатать  , так что просто сфоткала

Answer 2

To evaluate the expression 30а - 5(а + 3)² when а = 2, follow these steps:

1. Substitute the value of а with 2 in the expression.
2. Perform the calculations according to the order of operations (PEMDAS/BODMAS).

Let's go through the steps:

Step 1: Replace а with 2 in the expression: 30 * 2 - 5(2 + 3)²

Step 2: Calculate the innermost parentheses first: 2 + 3 = 5

Now, rewrite the expression with the result: 30 * 2 - 5 * 5²

Step 3: Calculate the exponent (power) in the expression: 5² = 5 * 5 = 25

Now, rewrite the expression with the result: 30 * 2 - 5 * 25

Step 4: Perform the remaining multiplications: 30 * 2 = 60 5 * 25 = 125

Now, rewrite the expression with the results: 60 - 125

Step 5: Finally, perform the subtraction: 60 - 125 = -65

The result of the expression 30а - 5(а + 3)² when а = 2 is -65.