Question

Use direct method to evaluate : (iv) (4 + 5x ) (4-5x)

Answer 1

Step-by-step explanation:

(4+5x)(4−5x)=(4) 2−(5) 2

=16−25x 2 [∵(a+b)(a−b)=a 2−b 2

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Answer 2

Answer:

(a+b) (a-b) = a^2 b^2

4^2-(5x^2)

16-25x