Question

guys answer this questions​

Answer 1

1...

2x"+x+4=0

we know that formula

x=-b+-√ b"-4ac/2a

compare the given equation with ax"+bx+c=0

a=2,b=1,c=4

x=-1+- √ 1"-4(2)(4)/2(2)

=-1+- √ 1-32/4

=-1+- √-31/4

x=-1+√-31/4,,-1-√-31/4...

2..

x"-5x-7=0

compare the given equation with ax"+bx+c=0

a=1,b=-5,c=-7

x=-(-5)+-√(-5)"-4(1)(-7)/2(1)

=5+-√25+28/2

=5+-√53/2

x=5+√53/2,,5-√53/2..

3..

x"+1=3x

x"-3x+1=0

compare the given equation with ax"+bx+c=0

a=1,b=-3,c=1

x=-(-3)+-√(-3)"-4(1)(1)/2(1)

=3+-√9-4/2

=3+-√5/2

x= 3+√5/2,,3-√5/2

I hope you understand well

Thank you