Identify each expression that is equivalent to (7x + 3y) (7x – 3y). Tr? – 3y2
(7x)2 + (-3y)
(7x)2 – (3y)
49x2 - 9y2

I know that the last one is right, but I can’t remember what happens when the negative sign is in the parenthesis, so my brain isn’t working and I need to know between option 2&3

the answer would be c:   ax + b = ax + c

step-by-step explanation:

there are infinitely many solutions.

d. corresponding side lengths in similar triangles are proportional in length.

step-by-step explanation:

“ a line segment that has the endpoints on the circle and passes through the midpoint is called the diameter. the diameter is twice the size of the radius. a line segment that has its endpoints on the circular border but does not pass through the midpoint is called a chord. a circle is the same as 360 small circle up the number 0 . i hope this .