Question

Use the quadratic formula to solve 2^2 − 5 − 5 = 0
The formula is : ( -b ± √b^2 - 4ac ) / 2a

Answer 1

x = 5/4 + √65/4 or x = 5/4 - √65/4

Explanation:

I'm assuming you mean 2x^2-5x-5=0?

x = ( -b ± √b^2 - 4ac ) / 2a

x = ( -(-5) ± √(-5)^2 - 4(2)(-5) ) / 2(2)

x = ( 5 ± √(25 + 40) ) / 4

x = ( 5 ± √65 ) / 4

x = 5/4 ± √65/4

Therefore, x = 5/4 + √65/4 or x = 5/4 - √65/4