Answer:
5x² - 10x - 15 = 0
Step-by-step explanation:
Given that the roots are x = 3 and x = - 1, then the factors are
(x - 3) and (x + 1) and the quadratic is the product of the factors, that is
f(x) = a(x - 3)(x + 1) ← a is a multiplier
Here a = 5, thus
f(x) = 5(x - 3)(x + 1) ← expand factors using FOIL
= 5(x² - 2x - 3) ← distribute parenthesis by 5
= 5x² - 10x - 15
Thus equation is
5x² - 10x - 15 = 0
Answer:
They are 9, 5 and 8
Step-by-step explanation:
Exact form: -55/18
Decimal form: -3.05 repeating
Mixed form: -3 1/18
In 1 second it beats about 53 times
In 5 seconds it will beat about (53/1*5) times
= 265 times
