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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 7 - Mathematics
4.29 Fill in the Blanks - I

(2x-3)(4x+5) = 8x2_____-15.

Here the middle term is missing.
Middle Term = multiply the two terms which are at the extremes and which are in the middle and add the result.
That is (2x).5 + (-3)(4x) = 10x-12x
= -2x.
Therefore (2x-3)(4x+5) = 8x2-2a-15.

Directions: Fill in the blanks for the following problems. Also write at least ten examples of your own.
Q 1: (7x+2)(2x+2) = 14x2+___+4.

Q 2: (4x+3)(6x-3) = 24x2+___-9.

Q 3: (9x-9)(8x+7) = 72x2-9x____.

Q 4: (8x-9)(3x-9) = 24x2___+81.

Q 5: (2a+4)(3a+4) = 6a2+___+16.

Q 6: (2x-4)(3x-4) = 6x2-___+16.

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Question 8: This question is available to subscribers only!

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