Question

What are the x-intercept(s) of the graph of y + 20 = x2 − x?

(−5, 0) and (4, 0)

(5, 0) and (−4, 0)

(−5, 0) and (−4, 0)

(5, 0) and (4, 0)

Answer 1

Always for finding x intercept, put y = 0..

\[0 + 20 = x^2 - x\]

Subtract 20 both the sides:

\[x^2 - x - 20 = 0\]

Now factorize it to find x..

Answer 2

is it the third option

Answer 3

Show me that what you got after factorization??

Answer 4

ok give me a sec i sorta did this in a rush

Answer 5

let me try again see if i get it right this time

Answer 6

Take your time..

Answer 7

i got 1/2?

Answer 8

How ??

Answer 9

I said to make factors..

Answer 10

x is aprox 4.944 and x is aprox -3.944

Answer 11

so then second option?

Answer 12

Yes second is good but your method is not right..

Answer 13

oh can you explain

Answer 14

\[x^2 - x - 20 = 0\]
\[x^2 - 5x + 4x - 20 = 0\]
\[(x-5)(x+4) = 0\]

\[x - 5 = 0 \implies x = 5\]
\[x + 4 = 0 \implies x = -4\]

Answer 15

\[(5,0) \; \; and \; \; (-4, 0)\]

Answer 16

oh i see what i did wrong i was following the quadratic formula instead of factoring srry