Huh? x^2 + 1 = 0 has no real zeros
x = + or - sqrt (-1) = +i or -i
let y = x^2
y^2 - 13 y + 36 = 0
I will do this by completing the square so you see how
y^2 - 13 y = -36
take half of 13, sqare it, add to both sides
y^2 - 13 y +169/4 = -36 + 169/4
(y-6.5)^2 = 6.25
y - 6.25 = +2.5 or y - 6.25 = -2.5
y = 8.75 or y = 3.75
BUT y = x ^2
x = + sqrt(8.75)
x = -sqrt (8.75)
x = + sqrt (3.75)
x = -sqrt(3.75)
x^2+4x9=0 This has a typo but I already showed you how to complete square above.
One thing is that coef of x^2 must be one. In your problems it already is, but if it were not, you would have to divide both sides by the non-zero coefficient of x^2 before starting.
Answer this Question
maths-complex numbers - by using the substitution w = z^3, find all the ...
Algebra - I distributed 3x^2+x-10=f(x) to find the zeroes. My book's answer was...
algebra - Will someone please look over these? I am so lost on these. 1. find ...
math - can someone show me the steps for this problem because i got it incorrect...
College Algebra - I need a little help with this problem. P(x)=2x^4-17x^3+47x^2-...
Math - T=10d+20 Solve for d. I got T/10-2=d Is this correct? and.... L=9.2+0.17m...
algebra - Find the domain and range of the function. 1. f(x)= x^2-x I got: ...
algebra - 1 Solve the set of linear equations by the matrix method : a+3b+2c=3...
Algebra - Let f(x)=px+q, where p and q are real numbers. Find p+q if f(f(f(x...
Maths - f:x -> (4x²-8x-21)/(x²-1) (a) Analyse (b) Sketch I'm struggling on (a...