Question

please explain these problems, i dont understand them

Answer 1

@hartnn please!!

Answer 2

what problems ?

Answer 3

State the domain and range for the function f(x) = 2x^2 – 7.

Answer 4

domain and range for that

Answer 5

a polynomial in x always have the domain as all real numbers

Answer 6

ohh

Answer 7

and range?

Answer 8

can you find the vertex of that curve (parabola) ?

Answer 9

how would i do that?

Answer 10

for
\(y= ax^2+bx+c\)
the vertex is -b/2a

Answer 11

-0/4

Answer 12

yes, so
the x co-ordinate of the vertex is 0

find the y co-ordinate by plugging in
x=0 in
y= 2x^2 -7

Answer 13

-7

Answer 14

yes, so the vertex is (0,-7)

since the co-efficient of x^2 is positive, the parabola will open upwards.

hence the range of y will be
\(y \ge -7\)

Answer 15

thank you! such a good explanation!

Answer 16

welcome ^_^