11.6 Quadratic Equations in Action and a Look Ahead
Point 4 of 5
11.6.4 Number, Travel, and Mixed Problems
Core idea
Once a product shows up in two-digit-number or meeting-and-catching-up problems, the equation climbs to second degree — set the unknown and solve just the same.
Module goal. Use quadratic equations to solve real problems about area, growth rates, and more, then carry the "equals" mindset toward the next stage's "not equals."
eastmath.com · 11.6 Quadratic Equations in Action and a Look Ahead · 11.6.4 Number, Travel, and Mixed Problems