Question

Solve the following eqn by formula method. x ²-4x - 3=0 ​

Answer 1

Answer:

2+7½ , 2-7½

Step-by-step explanation:

a = 2, b = -4, c = -3

apply this in quadratic equation

then you will get two answers with different sign that is your X

Answer 2

$\sqrt({-4)^{2} -4(1)(-3)}$Answer:

(2+√7)(2-√7)

Step-by-step explanation:

x ²-4x - 3=0 ​

From that,

a=1

b=-4

c=-3

-b±$\sqrt{b^{2} -4ac}$÷2a

-(-4)±$\sqrt({-4)^{2} -4(1)(-3)}$÷2

-(-4)±$\sqrt{16+12}$÷2

4±$\sqrt{28}$÷2

4±2√7÷2

2(2±√7)÷2

(2±√7)

the factors are (2+√7) and (2-√7)