Simplify these expressions. If you get equivalent to:
Sa+b colour orange
3a+5b colour blue
3b or 3b- colour green
6b, 12b or b colour red​

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth