Math, asked by aymansparta7, 9 months ago

(a) Expand the expression (3x-7)(2x+7)
(b) Without using long multiplication or a calculator, use the above expansion with an appropriate substitution of x to find the value of 53*47

Answers

Answered by harshit622

5

Answer:

3x(2x+7)-7(2x+7)

= 6x^2 + 21x -14x -49

= 6x^2+7x-49 is the answer of 1st question

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