10 - Equations / Inequalities

Question 1

What would this be an example of and what would the expanded version not contain?
(x + n)(x - n)

Answer 1

Difference of two squares.

once expanded there is no bx value

Question 2

When how would you represent x ≤ 8 and x < 8 on a number line

Answer 2

They would both be arrows going from 8, backwards. ≤ would have a filled in circle, < would have an empty circle.

Question 3

When a simultaneous equation features x² + y² =

what do you do?

Answer 3

You rearrange the other to make either x or y the subject and substitute that in

Question 4

What is the quadratic formula?

Answer 4

(b² ± √(b² - 4ac) ) / 2a

Question 5

How do you complete the square?

Answer 5

I dont really know tbh can someone pls help??