Question

Someone please help me with problem....
If (a,20) is a point on the graph of y=x^2+x what is a?

Answer 1

start by setting the equation equal to 20, so 20=x^2+x. then solve.

Answer 2

then factor the x side.

Answer 3

plug the (a, 0) to the (x, y) variables and solve for "a", just like the 2 previous ones you've posted

Answer 4

Answer is 4.