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You're better off posting this in the maths forum: http://www.thestudentroom.co.uk/forumdisplay.php?f=38
If a quadratic has equal roots, what does this tell you about the discriminant?
If a quadratic has equal roots, what does this tell you about the discriminant?
For part a) use b^2 - 4ac = 0 to finde out the value of P. Remember that c =(3p + 4).
Then for partb) you get the value of p and use it in the equation to get it in the for of
ax^2+bx+c=0 Then you simply factorise and the value of x.
Then for partb) you get the value of p and use it in the equation to get it in the for of
ax^2+bx+c=0 Then you simply factorise and the value of x.
Sorry guys just re read my post and saw it 
Its a quadratic if I rearrange it and 2^2 is 4 to it should be b^2 = 4p^2
Once solved I get P = 4, -1 which is right
Really greatfull for the help thanks
Would you mind helping me with this one too?
7.
An athlete prepares for a race by completing a practice run on each of 11 consecutive
days.
On each day after the first day, he runs further than he ran on the previous day.
The lengths of his 11 practice runs form an arithmetic sequence with first term a km and
common difference d km.
He runs 9 km on the 11th day, and he runs a total of 77 km over the 11 day period.
Find the value of a and the value of d.
Thank You
Its a quadratic if I rearrange it and 2^2 is 4 to it should be b^2 = 4p^2
Once solved I get P = 4, -1 which is right
Really greatfull for the help thanks
Would you mind helping me with this one too?
7.
An athlete prepares for a race by completing a practice run on each of 11 consecutive
days.
On each day after the first day, he runs further than he ran on the previous day.
The lengths of his 11 practice runs form an arithmetic sequence with first term a km and
common difference d km.
He runs 9 km on the 11th day, and he runs a total of 77 km over the 11 day period.
Find the value of a and the value of d.
Thank You
oh my god they left you on seen for 12 years ouch
(a)as D= 0 b^2 -4ac(2p)^2 4(1)(3p 4)4p^2 - 12p - 16, solve for pso p= 4 or p= -1but negative value is not reqieredso p= 4 (b)as p= 4x^2 2(4)x (3(4) 4)= 0x^2 8x 16, solve for xx= -4
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