kwizNET Subscribers, please login to turn off the Ads!
Email us to get an instant 20% discount on highly effective K-12 Math & English kwizNET Programs!

Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
7.18 Formula for a2-b2 Difference of Two Squares

Formula:
Consider the product (a+b).(a-b).
(a+b).(a-b) = a.a + b.a + a.(-b) + b.-b
= a2 + ab - ab - b2
Therefore (a+b)(a-b) = a2-b2
a2-b2 = (a+b)(a-b)

a2-b2 = (a+b)(a-b)

Directions: Solve the following problems. Also write at least ten examples of your own.
Q 1: (9x+5y)(9x-5y) = _____?
9x2-5y2
(9x)2-(5y)2
(9x)2+(5y)2
(x)2+(5y)2

Q 2: (6a-7b)(6a+7b) = _____?
(12a)2-(6b)2
(6a)2-(7b)2
6a2-7b2
(a)2+(7b)2

Q 3: (3a-b)(3a+b) = _____?
9a2-b2
9a2-3b2
3a2-b2
6a2-b2

Q 4: (c-d)(c+d) = _____?
2c2-d2
c2-d2
c2+d2
d2-c2

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!


Subscription to kwizNET Learning System offers the following benefits:

  • Unrestricted access to grade appropriate lessons, quizzes, & printable worksheets
  • Instant scoring of online quizzes
  • Progress tracking and award certificates to keep your student motivated
  • Unlimited practice with auto-generated 'WIZ MATH' quizzes
  • Child-friendly website with no advertisements
  • Choice of Math, English, Science, & Social Studies Curriculums
  • Excellent value for K-12 and ACT, SAT, & TOEFL Test Preparation
  • Get discount offers by sending an email to discounts@kwiznet.com

Quiz Timer