Question

Joyce is trying to solve the equation y = x2 − 8x + 7 using the quadratic formula. She has made an error in one of the steps below. Find the step where Joyce went wrong.

first step
second step
3rd step
4th step

Answer 1

here are the steps she took.

Answer 2

oops there is only 1 step hold on

Answer 3

here

Answer 4

the first step is at the top

Answer 5

first step technically. the error is that the substitution of -8 was never done. the formulea is x= -b therefore if -8 was substituted in it should have been -(-8) in the first step not -(8). so the end result should have an 8 not a -8

Answer 6

ok thank you

Answer 7

pleasure