The quadratic equation 2x^2-8x+1 = 0 has roots a and b. Find the value of a + b and ab
There is no need to solve the quadratic equation here. Use the formulae for the sum and product of roots where:
a+b = -b/a
and
ab = c/a
Therefore in this instance:
a+b = -(-8)/2 = 4 and ab = 1/2
AK
Related Maths IB answers
All answers ▸Given two functions f and g where f(x)=3x-5 and g(x)=x-2. Find: a) the inverse f^-1(x), b) given g^-1(x)=x+2, find (g^-1 o f)(x), c) given also that (f^-1 o g)(x)=(x+3)/3, solve (f^-1 o g)(x)=(g^-1 o f)(x)
what is the geometrical meaning of the derivative of a function f?
If the fourth term in an arithmetic sequence is, u4 = 12.5, the tenth is u10 = 27.5. Find the common difference and the 20th term.
What is a geometric sequence?