(03.07)
Which of the following is a solution of x2 − 7x = −5?

7 plus or minus the square root of 69 divided by two
7 plus or minus the square root of 29 divided by two.
negative 7 plus or minus the square root of 29 divided by two
negative 7 plus or minus the square root of 69 divided by two.

Question

(03.07)
Which of the following is a solution of x2 − 7x = −5?

 7 plus or minus the square root of 69 divided by two
 7 plus or minus the square root of 29 divided by two.
 negative 7 plus or minus the square root of 29 divided by two
 negative 7 plus or minus the square root of 69 divided by two.

welshfella · Answer

x^2 -7x + 5 = 0

the general form is 
ax^2 + bx + c = 0

to solve for x use the quadratic formula

x = [-b +/- (b^2 - 4ac)]/2a

welshfella · Answer

plug in the values a = 1, b = -7 and c = 5

anonymous · Answer

would it be negative 7 plus or minus the square root of 29 divided by two?

welshfella · Answer

No
the first part is incorrect 
substituting for b = -7

-b = - (-7) =  ?

anonymous · Answer

7

welshfella · Answer

yes

welshfella · Answer

so B is the correct option

anonymous · Answer

i knew it!