college algebra
posted by ladybug .
if (a,20) is a point on the graph of y=x^2+9x, what is a?

solve for x:
20 = x^2 + 9x
x^2+9x+20 = 0
(x+5)(x+4) = 0
so, a = 4 or 5
Respond to this Question
Similar Questions

College Algebra
find th quadratic fuction that has a vertix of (8.3) and whose graph goest throught the point (6, 395) 
College Algebra
1.Answer the following for the given quadratic function. f(x) = 2x^2  8x  13 (a) does the graph of f open up or down? 
college algebra, Please help!!
Answer the following function. f(x)=2x^2x1 A. Is the point (2,9) on the graph of f? 
college algebra, Please help!!
Answer the following function. f(x)=2x^2x1 A. Is the point (2,9) on the graph of f? 
college algebra
Graph the following function using transformations. Be sure to graph all of the stages on one graph. State the domain and range. For example, if you were asked to graph y= x^2+11 using transformations, you would show … 
college algebra
Question 638522: Graph the following function using transformations. Be sure to graph all of the stages on one graph. State the domain and range. For example, if you were asked to graph y= x^2+ 1 using transformations, you would show … 
College algebra
Answer the questions about the following functions. f(x) = 14^2/x^4 + 49 (a) Is the point (sqrt 7,1) on the graph of f? 
College Algebra
If the point P is on the graph of a function f, find the corresponding point on the graph of the given function. P(4,9) y=1/3f(1/2x)1 
College Algebra
take the indicated quadratic inequality x^2−13x+36≤0 A)determine the type of graph B)does it go up or down C) the size D)graph the equation E)define the vertex F)X intercept G) Yintercept H)focal point 
College Algebra
take the indicated quadratic inequality x^2−13x+36≤0 A)determine the type of graph B)does it go up or down C) the size D)graph the equation E)define the vertex F)X intercept G) Yintercept H)focal point