Question

( 2x+5 )टू एक्स प्लस 5 होल स्क्वायर माइनस टू एक्स माइनस 5 होल स्क्वायर ​

Answer 1

Answer:

(2x+5)²-(2x-5)².

(2x+5)².

By using formula (a+b)²=a²+2ab+b² where a=2x & b=5.

(2x+5)²=(2x)²+2(2x)(5)+(5)².

=4x²+20x+25.

(2x-5)².

By using formula (a-b)²=a²-2ab+b² where a=2x & b=5.

(2x-5)²=(2x)²-2(2x)(5)+(5)².

=4x²-20x+25.

(2x+5)²-(2x-5)²=(4x²+20x+25)-(4x²-20x+25).

=4x²+20x+25-4x²+20x-25. (Because -×-=+ & -×+=-).

=40x. (Because +×-=- so, 4x²-4x² & 25-25 will cancel i.e., it will be zero(0) & +×+=+).

I think this is your answer.