Practice Flashcards: ACT Mathematics — quadratics, systems, inequalities and the coordinate plane | Zestly

Question 1

Factoring a quadratic

Accepted Answer

Find two numbers that multiply to the constant term and add to the coefficient of the linear term.

Question 2

The quadratic formula, and when it earns its keep

Accepted Answer

For ax^2 + bx + c = 0 the roots are (-b plus or minus the square root of (b^2 - 4ac)) all over 2a. Try factoring first: it is faster when the numbers are small whole ones. Reach for the formula when nothing factors, or when b^2 - 4ac is not a perfect square.

Question 3

Substitution method

Accepted Answer

Solve one equation for one variable and substitute that expression into the other equation.

Question 4

Elimination method

Question 5

Inequality multiplication rule

Question 6

Slope from two points

Question 7

Parallel lines slope

Question 8

Perpendicular lines slope

Question 9

Point-slope form

Question 10

Slope-intercept form

Question 11

Distance between two points

Question 12

Midpoint of a segment