Question

HEEEEEELP

question in the attached picture

Answer 1

1)
`x^(2) +2x-10=0`
a=1
b=2
c=-10

`x= \frac{-(2) +or- \sqrt{ 2^(2)+4(1)(-10) } }{2(1)}`

`x= (-2 + or - √(4+40) )/(2)`

`x= (-2 +or- √(44) )/(2)`

`x= (-2+or- 2√(11) )/(2)`

`x= -1+or- √(11)`

`√(11)=3.32`
-1+3.32 = 2.32
-1-3.32 = -4.32

2)
`x^(2) -2x-9=0`
a=1
b=-2
c=-9

`x= \frac{-(-2)+or- \sqrt{ (-2)^(2)+4(1)(-9) } }{2(1)}`

`x= (2+or- √(4+36) )/(2)`

`x= (2+or- √(40) )/(2)`

`x= (2+or-2 √(10) )/(2)`

`x=1+or- √(10)`

`√(10) =3.16`
1+3.16 = 4.16
1-3.16 = -2.16

3)
`x^(2) -9x+5=0`
a=1
b=-9
c=5

`x= \frac{-(-9)+or- \sqrt{(-9)^(2)-4(1)(5) } }{2}`

`x= (9+or- √(81-20) )/(2)`

`x= (9+or- √(61) )/(2)`

`x= (9)/(2) +or- ( √(61) )/(2)`

`√(61) = 7.81`

`(7.81)/(2) =3.91`

`(9)/(2)=4.5`
4.5+3.91 = 8.41
4.5-3.91 = 0.59