If I have the equation y = 7x^2 + 3, what will the value of y be when I input x = 4?

To find the output of the equation y = 7x² + 3 when the input is x = 4, we will substitute the value of x into the equation and perform the necessary calculations.

1. Substitute x with 4:
y = 7(4)² + 3

2. Calculate (4)²:
(4)(4) = 16

3. Now, replace (4)² in the equation:
y = 7(16) + 3

4. Multiply 7 by 16:
7 * 16 = 112

5. Finally, add 3:
y = 112 + 3 = 115

Therefore, when the input x is 4, the output y is 115.