Okay, I'll handle this special case. Okay, I'll handle this other special case. Okay...

• Removal of multiples of 0 was not mentioned in the description.

• Example and sample tests like below should be added

test.assert_equals(quadratic_builder("(x+0)(x+1)"), "x^2+x")
test.assert_equals(quadratic_builder("(2q+3)(2q-3)"), "4q^2-9")

• Description also does not mention that m and p will never be 0, also n and q can be 0

• Description should be language-agnostic (removal of function names)

This is actually an issue!

Haskell tests appear to be broken. My solution failed on the randomized tests:
Falsifiable (after 7 tests and 4 shrinks):
"aa\71319a"
expected: "a2a"
but got: "aa\71319a"
Is \71319 supposed to be a character?

There's a pattern indeed but I can't figure it out

Fixed!

Removal of multiples of 0 was not mentioned in the tasks.

ie something like 6x^2+0x-1. should become 6x^2-1.

Thanks

No, it's not available on codewars:

https://docs.codewars.com/languages/python

Can I use, sympy?

.

Thanks, really my bug , found an error - I missed one index

Okay so I tried your code and it seems that for the test case (-y+11)(-55y-6) your answer is y^2-5y-66, which is wrong.
The answer should be 55y^2-599y-66.
I think maybe it's caused by the "-y" in the first bracket which doesn't have a number coefficient?
By the way my test case doesn't include (y-11)(y+6).
Please check your code again and let me know if there are any further problems.

i have the problem with one test case on python
i have this answer y^2-5y-66 but it should be 55y^2-599 y-66
i think it's incorrect case because
My program in case (𝑦−11)(55𝑦+6) got 55y^2-599 y-66
and in case (y-11)(y+6) got y^2-5y-66 and it is correct
Plese check this test case
I've complete all test except this one

Thank you for your answer and for the kata.