Real Roots A Level Maths
I'm stuck on 11 part b and c. Do you use the discriminate. I tried and got the wrong answer completely.
(edited 4 years ago)
b^2 - 4ac > 0
Original post by ThomH97
What inequality do you get when you use the discriminant?
Original post by Anonymous_4657
b^2 - 4ac > 0
I tried putting values in but the answer was something completely different.
Original post by Anonymous_4657
I tried putting values in but the answer was something completely different.
What do you get when you sub the values?
Original post by Anonymous_4657
I tried putting values in but the answer was something completely different.
Are you using b is -20cos(theta), a is 1 and ç is 75?
cos theta > -1/6000
Original post by Anonymous_4657
cos theta > -1/6000
How?
(1)^2 - 4(-20cos theta) (75) > 0
1 + 6000cos theta > 0
cos theta . -1 /6000
1 + 6000cos theta > 0
cos theta . -1 /6000
Original post by Anonymous_4657
(1)^2 - 4(-20cos theta) (75) > 0
1 + 6000cos theta > 0
cos theta . -1 /6000
1 + 6000cos theta > 0
cos theta . -1 /6000
b is -20cos(theta)
a is 1
c is 75
Try again?
I've got it now!
(edited 4 years ago)
Original post by Anonymous_4657
I don't know what I did wrong actually.
it is not
a^2 - 4bc > 0
it is
b^2 - 4ac > 0
Original post by mqb2766
b is -20cos(theta)
a is 1
c is 75
Try again?
a is 1
c is 75
Try again?
Can you help me with another maths question I've posted please?
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