In the following equation, identify the x-intercepts in the graph y = 3x2 + 19x – 40.

Question

hartnn · Answer

to find x-intercept put y=0,so u need to solve that quadratic equation...can u?

anonymous · Answer

0=6+19x-40?

hartnn · Answer

3x^2+19x-40=0....can u solve?

anonymous · Answer

3x^2+19x-40=0
                 -40   -40
3x^2+19x= -40

hartnn · Answer

u know quadratic equation formula?-b+root(b*b-4ac)/2a...this formula?

anonymous · Answer

nope lol

campbell_st · Answer

the quadratic will factorise....what are the factors of 40....

campbell_st · Answer

the factorised form is 

(3x + 8)(x - 5) = 0

you now need to find the intercepts by solving

3x + 8 = 0

and 

x - 5 = 0

good luck

hartnn · Answer

ae u sure campbell....coz i m getting (x+8)and (3x-5)

hartnn · Answer

which gives -8 and 5/3 and these are x-intercepts...