What is x^2-9x+4=0? .. i’m using this method: (x+b)^2-b^2=x^2+2bx

see explanation

Step-by-step explanation:

Given

x² - 9x + 4 = 0 ( subtract 4 from both sides )

x² - 9x = - 4

Using the method of completing the square

Add ( half the coefficient of the x- term )² to both sides

x² +2 (- )x + = - 4 +

(x - )² =

Take the square root of both sides

x - = ± = ±

Add to both sides

x = ± ← exact solutions

(4,5

look up a corrdinate plane and do what the thingy says and boom