Question

3x²-(3x-1)(x+2) при x=-3

Answer 1

3+9-(9-1)(-3+2)=12-27+18+3-2=3+3-2=4

Answer 2

To find the value of the expression 3x² - (3x-1)(x+2) when x=-3, we simply substitute -3 for x and perform the calculations step by step:

Step 1: Replace x with -3 in the expression. 3(-3)² - (3(-3) - 1)(-3 + 2)

Step 2: Calculate the values inside the parentheses first. 3(-3)² - (3(-3) - 1)(-3 + 2) 3(-9) - (3*-3 - 1)(-1)

Step 3: Continue with the calculations inside the parentheses. 3(-3)² - (3(-3) - 1)(-3 + 2) -27 - ((-9) - 1)(-1)

Step 4: Complete the calculations inside the parentheses. 3(-3)² - (3(-3) - 1)(-3 + 2) -27 - (-10)(-1)

Step 5: Evaluate the expression within the second set of parentheses. 3(-3)² - (3(-3) - 1)(-3 + 2) -27 - 10

Step 6: Finally, compute the value of the entire expression. 3(-3)² - (3(-3) - 1)(-3 + 2) -37

So, the value of the expression 3x² - (3x-1)(x+2) when x=-3 is -37.