Book Maths Puzzle Algebra

in which method we solve=
4x square-31x+21=0 ?
plz answer soon

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Book Other Question

suppose m and n are positive intergers.
a)How many points (m,n) satisfy m+n < 5?
b)Graph them all. Plot m on the x-axis and n on the y-axis. Find all rational roots of:

4x^3-7x^2-21x-18=0