Question

Which equation shows the quadratic formula used correctly to solve 5x² + 3x -4 = 0 for x?

-3± √(3)²-4(5)(-4)
2(5)
Xm.
3+√√(3)²+4(5)(-4)
2(5)
3+√√(3)²-4(5)(-4)
2(5)
-3± √(3)²+4(5) (-4)
2(5)

Answer 1

x = -3 ± √(3)² - 4(5)(-4)

_______________

2(5)

Explanation:

Because,

x = -b ± √ b² - 4ac

____________

2a

So,

x = -3 ± √ 3² -4(5)(-4)

______________

2(5)