SOLUTION: Find a bound on the real zeros of the polynomial function {{{ f(x)=x^4+2x^3-4x-7 }}}

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Question 937059: Find a bound on the real zeros of the polynomial function
+f%28x%29=x%5E4%2B2x%5E3-4x-7+
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Find a bound on the real zeros of the polynomial function
+f%28x%29=x%5E4%2B2x%5E3-4x-7+
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Use Rational Roots Theorem with synthetic divission
...0..|..1....2....-4....-7
...1..|..1....3....-1....-8
...2..|..1....4....4.....1 (2 is upper bound, real root between 1 & 2)
==========================
...0..|..1....2....-4....-7
..-1..|..1....1....-5....-2
..-2..|..1....0....-4.....1 (real root between -1 & -2)