Question

y = x2 + 10x + 25

What is the x-intercept of the graph of the equation above?

Answer 1

first factor it - can u do that?

Answer 2

you need 2 numbers whose product is + 25 and whose sum is +10
thats +5 and +5
so (x+5)(x+5) = 0 for x-intercepts

x = -5

the graph just touches the x-axis at x = (-5,0)