Question

If x=4, calculate the value of: x2 +2x

Answer 1

If x = 4

x² + 2x = 24

Substitute x by its value

4² + 2(4) 
16 + 8 = 24

Answer 2

We simply need to plug in x = 4 into x² + 2x

So plugging in x = 4, we get:

4² + 2(4)

Simplifying it, we get:

16 + 2(4)
16 + 8
24

When x = 4, x² + 2x will equal 24.