rove that x^3+4x +7 has no integral zeros
its x grade question(age 13 -14)without using calculus
Using the rational roots theorem
Rational root theorem - Wikipedia, the free encyclopedia
The only possible rational and hence possible integral zero are
and since none of these are zero's we are done
Hello, ayushdadhwal!
. .
We find that the graph is strictly increasing
. . and the only x-intercept occurs between (-2, -9) and (-1, 2)
. . (when the graph crosses the x-axis).
Hence, the only zero of the function occurs between and
Therefore, there are no integral zeros.