Question 603439
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi, Previously answered.
I don't understand why 2x^2=15-7x has the answer x=-5, 1.5
generally a quadratic EQ will have two roots
2x^2=15-7x 
2x^2 +7x - 15=0
factoring
(2x -3)(x + 5) = 0
(2x -3) = 0   x = 3/2 0r 1.5
(x + 5) = 0   x = -5
{{{drawing(300,300,   -6, 6, -6, 6,  grid(1),
circle(-5, 0,0.3),
circle(1.5, 0,0.3),

graph( 300, 300, -6, 6, -6, 6,0,2x^2 +7x - 15 ))}}}