Question

For the given equation, list the intercepts and test for symmetry: y=x^2-x-20

Answer 1

for x intercept put y =0 and get x
for y intercept put x =0 and get y

Answer 2

i know that part so then I get 0=x^2-x-20..im lost here

Answer 3

im not sure how to do the x..its been a while.. haha

Answer 4

0=x^2-x-20
0 = x^2-5x+4x -20
0 = x(x-5) +4(x-5)
0 = (x+4)(x-5)
means that
x = -4 and x = 5 which are required x- intercepts

Answer 5

wow.. im lost.. how did you get the -5x and 4x?

Answer 6

i feel so dumb haha

Answer 7

the crude working and the curve itself attached.

Answer 8

i got it by guess
actualy when we factorize an equation by grouping method we do guesses to find these proper numbers

Answer 9

have you ever done factorization y grouping method???

Answer 10

*by

Answer 11

......i dont know.. i havent taken a math class in so long..