Question

can someone tell me how to do this? i forgot :x

Answer 1

what does x intercept mean? y is 0? or x is 0? refer to the cartesian plane.

Answer 2

this is called the cartesian plane.
x intercept means what length does the curve cut from the origin.

Answer 3

origin is the intersection of x and y axis

Answer 4

as i said, x intercept is the length the curve cuts on the x axis. so we have to find where the curve cuts the axis. what would put equal to 0? y no?
correction: not from the origin in case of any curve. only in case of a staright line.

Answer 5

yup. you would get two points. the distance between those points will give you the length of intercept.

Answer 6

3x^2 + 19x – 40=0 solve.. take your time.

Answer 7

i deleted that. do it yourself. you'll learn better.

Answer 8

suppose the general equation is ax^2 +b x + c
when you have to solve this equation you always have to find those two numbers whose product is a*c and sum is b.
likewise, if you have ax^2 +b x - c , sum of the numbers has to be b and product has to be a*-c.
here, you have to find two number whose product is -120 and sum is 19.

Answer 9

can you now find those 2 numbes?

Answer 10

no no. those number arent the roots.
you have to do this way.
3x^2+19x-40=0

-->3x^2 +24x -5x -40=0

-->3x(x+8) - 5(x+8)=0

taking x+8 common

(3x-5)(x+8)=0

x=5/3,-8

we still dont have the intercept. first tell me if you got this.

Answer 11

basically we have to resolve 19 into 2 numbers which have the product -120 and sum 19.
it makes our job to find x easier.

Answer 12

yes. it can be confusing. take your time.
i'll recommend watching some vids on how to find roots. they can be really helpful.

Answer 13

nope. x intercept is the length the curve cuts on the x axis.
so basically the points you have are where the curve cuts the x axis right?
so what you would have to is. calculate the distance between 5/3 and 0(origin) and 0(origin) and -8.
these would be 5/3 and 8 respectively. add them and you have your answer.