Answer:
vertex = (7, - 18)
Step-by-step explanation:
given a parabola in standard form : ax² + bx + c : a ≠ 0
Then the x- coordinate of the vertex is
= -
y = 2x² - 28x + 80 is in standard form
with a = 2, b = -28 and c = 80, hence
= - = 7
substitute x = 7 into the equation for corresponding value of y
y = 2(7)² - 28(7) + 80 = 98 - 196 + 80 = - 18
vertex = (7, - 18)
#3 :Five years ago, Amy was six years younger than twice Sarah's age. In 4 years, the sum of their ages will be 45 years. How old will amy be in 10 years?
Answer:
#2 Karen is 7 years old
#3 Amy will be 31 years old in 10 years
Step-by-step explanation:
2#:
3#: