Question

the root of the equation 4*-5=1 is

Answer 1

Answer:

Correct option is

B

sin18

∘

, cos36

∘

Given eqiation is 4x

2

−2

5

x+1=0

We know quadratic equation is of the form ax

2

+bx+c=0

x=

2a

−b±

b

2

−4ac

x=

4

−−2

5

±

4(5)−4(4)(1)

x=

4

5

±1

Since sin18

0

=

4

5

−1

and cos36

0

=

4

5

+1

Step-by-step explanation:

f. o. l. l. o. w me