Question

What is the solution of the equation X^2+23=0

A. X=-6+sqrt59
B. X=-6+sqrt23
C. X=-6+sqrt13
D. X=-6+i sqrt13

Answer 1

are you sure you have the correct equation?

Answer 2

Oh sorry it's x^2+12x+23=0

Answer 3

@welshfella

Answer 4

Ok - do you know the formula for solving quadratic equations?

Answer 5

Something like ax+b...?

Answer 6

for the equation ax^2 + bx + c = 0

the formula is x = [ -b +/- sqrt(b^2 - 4ac)] / 2a

Answer 7

K..

Answer 8

if you compare this equation with that in the equation:-
ax^2 + bx + c = 0
and
x^2 +12x + 23 = 0

you can see which values of a , b and c you require

so a = 1, b = 12 and c = ?

cam you see what c is?

Answer 9

* can

Answer 10

23

Answer 11

right
so insert them in the formula

i'll start you off