Question

find the roots of
x² - 3x - 4 = 0 by
quadratic method​

Answer 1

Answer:

Explanation:

x

2

−

3

x

−

4

=

0

is of the form

a

x

2

+

b

x

+

c

=

0

, with

a

=

1

,

b

=

−

3

and

c

=

−

4

.

The quadratic formula gives us solutions:

x

=

−

b

±

√

b

2

−

4

a

c

2

a

=

3

±

√

3

2

−

(

4

×

1

×

−

4

)

2

⋅

1

=

3

±

√

9

+

16

2

=

3

±

√

25

2

=

3

±

√

5

2

2

=

3

±

5

2

That is

x

=

−

1

or

x

=

4

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