Question

15. (723 + 1992) - (723 - 1992)2 - 2912 x
1992 =?
(a) 5
(b) 18
(c) 128974
(d) None​

Answer 1

Step-by-step explanation:

(723+1992)^2 - (723-1992)^2 - 2912×1992=

(723)^2 + (1992) ^2 + 2(723) (1992) - (723)^2 - (1992)^2 + 2(723) (1992) - 2912×1922

= 2(723)(1992) + 2(723)(1992) - 4(728)(1992)

=4(723)(1992) - 4(728)(1992)

=4×1992(723-728)

=7968×-5

=-39840

Answer 2

The answer is (d)none.

Step-by-step explanation:

• According to the given information, the problem is (723 + 1992) - (723 - 1992)2 - 2912 x 1992 =?
• Now, we know that BODMAS rule says that first bracketed information should be solved, then relations with of in between must be solved, then relations with division in between must be solved, then relations with multiplication in between must be solved, then relations with addition in between must be solved and then finally, relations with subtraction in between must be solved.
• Here too, first, bracketed relations are solved first.

       (723 + 1992) - (723 - 1992)2 - 2912 x 1992

=2715-(-1269)2-2912*1992

• Next all the terms with multiplication in between must be solved.

      2715-(-1269)2-2912*1992

  = 2715-(-2538)-5800704

  =2715+2538-5800704

• Next addition and subtraction is done respectively.

2715+2538-5800704

=5253-5800704

=-5795451

Hence, the answer is (d)none.

Learn more here

https://brainly.in/question/49958844

Learn more

https://brainly.in/question/49455369