Question

Using suitable identity find the following products :

(i) (2x + 5 )(2 x + 6 )

(ii) 79 x 81​

Answer 1

Answer:

1) 2x (2x+6)+ 5(2x+6)

4x^2 + 12x + 10x+30

4x^2+22x+30

2) 79× 81

6399 ans

Answer 2

Answer:

1) (2x+5)(2y+5)

=(2x×2y+5×2y+5×2x+5×5)

=(4xy+10x+10y+25)

Hence, the value is (4xy+10x+10y+25).

2) 79×81

=6399

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