Question

Which shows 51^2 - 49^2 being evaluated using the difference of squares method?

Answer 1

512 - 492 = 2601 - 2401 = 200
512 - 492 = (51 + 49)(51 - 49) = (100)(2) = 200
512 - 492 = (51 - 49)2 = 22 = 4
512 - 492 = (2601 + 2401)(2601 - 2401) = 1,000,400

Answer 2

C. because difference of squares is like factoring. Taking two numbers and then squaring or factoring them (depending if it's a quadratic equation or not).

Answer 3

Thanks!

Answer 4

Can you help me with one more?

Answer 5

Ya sure!

Answer 6

Which of the following best describes the graph of f(x) = x2 - 3x - 10?

Answer 7

Minimum at (1.5, -12.25) with intercepts at (5, 0) and (-2, 0)
Minimum at (-1.5, -12.25) with intercepts at (-5, 0) and (2, 0)
Minimum at (-3.5, -2.25) with intercepts at (-5, 0) and (-2, 0)
Minimum at (3.5, -2.25) with intercepts at (5, 0) and (2, 0)

Answer 8

easier if you post anew, more eyes

Answer 9

That would be A. Look at www.desmos.com the calculator will be useful. Just type the equation and then see what points land on that equation.

Answer 10

Thanks :D I wish I could give you two medals Dx

Answer 11

Lol you can give me a medal for this question I answered for someone else: http://openstudy.com/study#/updates/55c29d5ae4b08de2ded201be

Answer 12

And you're welcome! :D