Question

is the x intercepts of the equation f(x)=5X^2-15 (0,-15)?

Answer 1

x intercept means y=0

Answer 2

or f(x) = 0
0 = 5x^2-15
15=5x^2
3=x^2
x = +/-sqrt(3)

Answer 3

so that's not an x intercept.

Answer 4

ok im lost then let me show you the whole problem

Answer 5

solve 5x^2=15.............thats the answer i got

Answer 6

yes that's right.

Answer 7

then find the x intercepts of f(x)=5x^2-15

Answer 8

y intercept would be -15? so would the x intercept be 0?

Answer 9

x intercept means y=0, solve for x
y intercept means x=0, solve for y

Answer 10

the x axis IS the y=0 axis.

the x intercept IS the y=0 intecept.

Answer 11

i have to type and orderd pair for the answer so i thought it would be 0,-15

Answer 12

so, you have written here:

when y=-15, x-0

this is NOT of the form: when y=0. x=__

Answer 13

0 is not equal to -15

Answer 14

f(x)= y =5x^2-15 = 0

5x^2-15 = 0 ; when x=__

Answer 15

im lost lol

Answer 16

5 times "something" - 15 = 0

we should know by know that: 15-15 = 0 so..

5 times "something" has to equal 15

5 times "3" = 15 .. soo

x^2 = something = 3

x^2 = 3 when x = +- sqrt(3)

Answer 17

algebra-wise that is:

5x^2 - 15 = 0
+15 +15
---------------
5x^2 = 15
/5 /5
---------------
x^2 = 3

sqrt(x^2) = +- sqrt(3)

x = +- sqrt(3)

Answer 18

therefore we have 2 solutions; 2, y=0 intercepts

(sqrt(3),0) and (-sqrt(3),0)

Answer 19

ooohh i see now lol