# Inequalities - Interval Notation

how do you put this in interval notation? 2x^2+x greater or equal to 1

### Comments for Inequalities - Interval Notation

 Jun 02, 2014 Inequalities - Interval Notation by: Anonymous how would you put in 4y-6 is less than 18 or 2y-2 is greater than -8

 Jun 04, 2014 Inequalities - Interval Notation by: Staff Part A 4y - 6 is less than 18 4y - 6 < 18 Add 6 to each side of the equation 4y – 6 + 6 < 18 + 6 4y + 0 < 18 + 6 4y < 24 Divide each side of the equation by 4 4y / 4 < 24 / 4 y * (4 / 4) < 6 * (4 / 4) y * 1 < 6 * 1 y < 6 the final solution of valid y values is: y < 6 >>> the final solution of valid y values in INTERVAL NOTATION is: y ∈ (-∞, 6) Interval notations: ∈ = element of a set Both “(” and “)” = open, value NOT INCLUDED ----------------------------

 Jun 04, 2014 Inequalities - Interval Notation by: Staff ---------------------------- Part B 2y - 2 is greater than -8 2y - 2 > -8 Add 2 to each side of the equation 2y - 2 + 2 > -8 + 2 2y + 0 > -8 + 2 2y > -6 Divide each side of the equation by 2 2y / 2 > -6 / 2 y * (2 / 2) > (-3) * (2 / 2) y * 1 > (-3) * 1 y > -3 the final solution of valid y values is: y > -3 >>> the final solution of valid y values in INTERVAL NOTATION is: y ∈ (-3, ∞) Interval notations: ∈ = element of a set Both “(” and “)” = open, value NOT INCLUDED Thanks for writing. Staff www.solving-math-problems.com