ВС. OppL'S
а
12 In the diagram alongside PQ = 30, QS = 10, SR = 15, RP = 40
and QR = 20.
Prove QS||PR.

b
If PS and QR intersect at X, calculate the length of QX. [6]
с
Express the area of APQR as a fraction of the area of PQSR.
Show all your calculations.
[6]
40
equo
30
20
R
[4]
0
10
15
S

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1  

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step-by-step explanatio89

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb

the answer is d

for problems like this theres an app, its photomath that explains the problem and gives the answer hope i