Question

Find the x-intercepts using the quadratic formula:
-2x^2+4x-15

Answer 1

HELLO SIR, X INTERCEPT HAPPENS WHEN Y=0

Answer 2

so I started it but I am not sure if I am solving it right

Answer 3

-4 += sqrt(4^2 - 4(-2)(-5) / 2(-2)

Answer 4

+-

Answer 5

c = -15

Answer 6

yep looks good

Answer 7

you can also try to factor or complete the square,

Answer 8

when I went to plug that in on my calculator, I get an error about non real

Answer 9

I didn't see a way to factor this quadratic

Answer 10

i dont think there is a way either

Answer 11

so when you solve for x using that quadratic formula

Answer 12

you can plug it back into the main formula y=-2x^2+4x-15, and see that the values of x you found does infact make y=0

Answer 13

so I get -4 +- sqrt(16 + 16(-15) / -4

Answer 14

the stuff under hte sqrt is a bit wrong

Answer 15

that is where I'm getting tripped up

Answer 16

-b +/- (sqrtb^2-4ac)/2a