Question

solve using quadratic formula
4x² + 3x - 1​

Answer 1

Answer:

X =11/2 and -7/2

Step-by-step explanation:

b^2-4ac=3^2-(4x-1) =9+16 =25

X=-b±√b^2-4ac/2a

X= -3+25/8 and -3-25/8

x=22/8 and -28/8

X =11/2 and -7/2

Answer 2

Answer:x=1\4 and x=-1

Step-by-step explanation: Here, a=4, b=3, c=-1

Discriminant, D= (b^2) - 4(a)(c)

D= (3^2) - 4(4)(-1)

D= 9 - (-16)

D= 9+16 = 25

Now, using quadratic formula,

x= -b +- $\sqrt{$D\ 2a

x= -3 +- $\sqrt{$25\2(4)

x= -3 +5\8       and x= -3 -5\8

x= 2\8              and x= -8\8

x= 1\4               and x= -1