Question

10х-5(х-9)+12х при х -7

Answer 1

$10x - 5(x - 9) + 12x = 10x - 5x + 45 + 12x = 17x + 45 \\ 17 \times 7 + 45 = 119 + 45 = 164$

Answer 2

To calculate the expression 10x - 5(x - 9) + 12x when x = -7, we need to substitute -7 in place of x and perform the arithmetic operations. Let's proceed step by step:

Step 1: Substitute x with -7 in the expression: 10(-7) - 5(-7 - 9) + 12(-7)

Step 2: Perform the operations inside the parentheses: -70 - 5(-16) - 84

Step 3: Continue with multiplication: -70 + 80 - 84

Step 4: Perform addition and subtraction from left to right: -70 + 80 = 10 10 - 84 = -74

So, the value of the expression 10x - 5(x - 9) + 12x when x = -7 is -74.