Question

find the roots of quadratic equation by using quadratic formula 2x²+x-4=0​

Answer 1

Answer:

x= 2.4 or 1.1675

Step-by-step explanation:

2x²+x-4=0

Or, x = −b ± √(b²− 4ac)/2a (according to quadratic equation)

Or, x= - 1 ± √(1² - 4*2*4)/2*2 ( a=2, b=1, c=4)

Or, x= - 1 ± √(1 - 32)/4

Or, x= - 1 ± √(-31) /4

Or, x= - 1 + √(-31)/4 Or, x= - 1 - √(-31)/4

Or, x= (-4 + ( - 5.67))/4 Or, x= ( - 1 - ( - 5.67))/4

Or, x= - 2.4 Or, x= 1.1675

So, x= - 2.4 or 1.1675