If -2 is the root of the quadratic equation x^2-5x+c=0 find the value of c
1 answer:
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The square of a binomial expands as follows:
Expanding all the binomials, we have
Sum like terms:
Simplify terms appearing on both sides:
Move all terms involving k to the left and all numbers to the right:
Divide both sides by -20:
Answer:
see explanation
Step-by-step explanation:
These are the terms of a geometric sequence with n th term
= a
Where a is the first term and r the common ratio
r = =
=
= 2
and a = 5, hence explicit equation is
= 5