This is super hard. Need answer asap!
If y = 2x2 – 4x, what is the value of y when x equals 5?
A. 10
B. 30
C.80
D.480
y = 2x^2 – 4x I suspect you mean
y = 2 * 25 - 20 = 50 - 20 = 30
Not super hard, try harder.
Hard? Not so. If
y = 2x^2-4x
then what is y when x=5? Just replace all the x's with 5's and you have
y = 2*5^2 - 4*5 = 30
To find the value of y when x equals 5, you can substitute the value of x into the equation y = 2x^2 - 4x.
Step 1: Start with the equation y = 2x^2 - 4x.
Step 2: Replace x with 5 in the equation as we want to find the value of y when x equals 5.
y = 2(5)^2 - 4(5)
Step 3: Simplify the equation by calculating the values inside the parentheses first.
y = 2(25) - 4(5)
Step 4: Simplify further by performing the multiplication operations.
y = 50 - 20
Step 5: Perform the subtraction operation to get the final value of y.
y = 30
Therefore, when x equals 5, the value of y is 30.