Question

What is the value of the expression below when x = 7x = 7?
2x²−5x −3

Answer 1

To find the value of the expression 2x²−5x−3 when x = 7, substitute 7 into the expression, compute the square, and perform the arithmetic to arrive at the value of 60.

Step-by-step explanation:

The student has asked for the value of the expression 2x²−5x−3 when x = 7. Let's solve this step by step:

1. First, substitute the value of x into the expression: 2(7)² - 5(7) -3.
2. Calculate the square of 7 which is 49. This gives us 2(49) - 5(7) - 3.
3. Multiply 2 by 49 to get 98, and then multiply 5 by 7 to get 35.
4. Now we have 98 - 35 - 3.
5. Subtract 35 from 98 to get 63, and then subtract 3 to get the final answer.

So, the value of the expression when x = 7 is 60.