Algebra 2
posted by Ana .
How would you find the x intercepts of 2x^2+17=0. The original equation is 2(x3)^21.

To have xintercepts you must have a function,
I bet your equation was
y = 2(x3)^2  1 or f(x) = 2(x3)^2 1
then
y = 2(x^2  6x + 9)  1
y = 2x^2  12x + 17 , your expansion was incorrect
so at the xintercept, y = 0 and
2x^2  12x + 17 = 0
x = (12 ± √8)/4
= (12 ± 2√2)/4
x = (6+√2)/2 or x = (6  √2)/2 
thanks so much!
Respond to this Question
Similar Questions

Algebra
5. Find the x and y intercepts of each linear equation. Be sure to write your answers as ordered pairs. y = 3x  6 6y = x + 2 The y intercepts is when x=0 So put in x=0 in each, and solve for y. The x intercepts is when y=0, put in … 
Algebra
What would three points on a graph be, graphing the x and y intercepts, with the equation x + 3y = 9? 
Algebra
Here's the question I'm having trouble with: Tell how you would identify the intercepts for the graph of the equation: 3x + 6y = 18 I'm not exactly sure how you would find the intercepts from this equation. Thanks! 
Algebra I
Did I do these probelms correctly? Find the intercepts 1. y^2 = x^2  4x y^2 = x(x  4) Y intercepts y^2 = 0(0  4) (0,0) x intercepts 0 = x(x  4) 0 = x  4 4 = x (4,0) 2. y = (x (x + 3))/(3x + 1)^2 y intercetps y = (0(0 + 3))/(3(0) 
algebra
2x+5y=15 Find the x and yintercepts and graph the equation plotting the intercepts. Please show all of your work. 
algebra
find the x and y intercepts and graph the equation plotting the intercepts 6x7y=42 
algebra
want to know if this right find the x and y intercepts of the equation plotting the intercepts 3x5y=15 3x5(0)=15 3x0=15 3x=15 x=5 the x intercepts are (5,0) find the y 3x5y=15 3(0)5y=15 05y=15 5y=15 y=3(0,3) 
algebra
Suppose that a quadratic equation had two xintercepts. How could you use the intercepts to find the vertex? 
Algebra
Find the x and y intercepts and graph the equation plotting the intercepts.Show work...5x+8y=40 
College Algebra
Suppose that the Quadratic equation had two Xintercepts. How could you use the intercepts to find the vertex?