Answer:
x = -3 or x = 5/2
Step-by-step explanation:
Solve for x:
2 x^2 + x - 15 = 0
The left hand side factors into a product with two terms:
(x + 3) (2 x - 5) = 0
Split into two equations:
x + 3 = 0 or 2 x - 5 = 0
Subtract 3 from both sides:
x = -3 or 2 x - 5 = 0
Add 5 to both sides:
x = -3 or 2 x = 5
Divide both sides by 2:
Answer: x = -3 or x = 5/2
