Mathematics for IGCSE & O level - Graphs Of Functions (Section 1 - No. 37)

For the graph of y = x² + 2x + 1, where does the graph touch the x-axis?

x = -1

x = 0

x = 1

x = 2

The graph touches at the root, which we find through factorizing: (x+1)² = 0. The root is -1