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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
7.35 Special Products: (ax+b)(cx+d)

Formula : (ax+b)(cx+d) = acx2+x(ad+bc)+b.d


Example:
Find the product of (2x+3)(2x+5).
Solution:
Using above formula,
Here a=2, b=3, c=2 and d=5
(2x+3)(2x+5) = (2.2)x2+x(2.5+3.2)+3.5
= 4x2+x(10+6)+15
= 4x2+16x+15

Directions: Solve the following problems. Also write at least ten examples of your own.
Q 1: Find the product of (x+2)(3x+5).
3x2+9x+10
3x2+11x+8
None of these
3x2+11x+10

Q 2: Find the product of (2x+3)(3x+5).
6x2+19x+15
6x2+19x+12
6x2+17x+15
None of these

Q 3: Find the product of (4x-3)(3x+4).
12x2+7x-12
None of these
12x2+9x-12
12x2+7x-8

Q 4: Find the product of (7x-2)(2x-3).
None of these
14x2-25x+4
14x2-25x+6
14x2-15x+6

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!


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