156k views
3 votes
Rhett is solving the quadratic equation 0= x2 – 2x – 3 using the quadratic formula. Which shows the correct substitution of the values a, b, and c into the quadratic formula?

User Kulan
by
8.2k points

2 Answers

1 vote

Answer:

its A

Explanation:

guessed and got it right

User Hee
by
7.4k points
6 votes
Hi, the quadratic formula is:
\boxed{X= \frac{-b \pm \sqrt{b ^(2)-4ac} }{2a}}

Values:
a = 1; b = - 2; c = - 3
SOLVING:


0=X ^(2)-2X-3


X ^(2)-2X-3=0


X= \frac{-(-2) \pm \sqrt{(-2) ^(2)-4(1)(-3) } }{2(1)}


X= (2 \pm √(4+12) )/(2)


X= (2 \pm √(16) )/(2)


X= (2 \pm4)/(2)

Getting X₁:

X₁
=
(2+4)/(2)

X₁
=
(6)/(2)

X₁ =
\boxed{ \boxed{ \textbf{3}}}\ ===>\ The\ first\ solution.


Getting X₂:


X₂
=
(2-4)/(2)

X₂ =
(-2)/(2)

X₂ =
\boxed{ \boxed{ \textbf{-1}}}\ ===>\ The\ second\ solution.

GOOD LUCK...!!!
User Aristea
by
8.5k points

Related questions

2 answers
0 votes
12.7k views
asked Nov 21, 2017 113k views
Nostop asked Nov 21, 2017
by Nostop
7.4k points
1 answer
3 votes
113k views