The x intercept is not 10!
f(x)=0.75x-7
x= 7/0.75 ≠ 10
so last one is false!
(for finding x intercept make the y/f(x) value 0)
For linear, the y-differences are equal. An example is the total cost of buying a single type of item.
Quadratic - the 2nd differences are equal,. Example: path of a kicked ball
Cubic - the 3rd differences are equal. Example: modeling the shapes of vases or curved designs
Exponential - the y-ratios are equal. Example: growth of bacteria
Answer:
see explanation
Step-by-step explanation:
2x² - 7 = 9 ( add 7 to both sides )
2x² = 16 ( divide both sides by 2 )
x² = 8 ( take square root of both sides )
x = ± 
← exact values
This method is useful when there are only numeric values to deal with
