Question

n2 + 721n- 9972=0 please answer​

Answer 1

$\sf\huge\bold{\underline{\underline{{Solution}}}}$

we have given Equation n²-721n -9972=0

it is in the form of a quadratic equation so,we use quadratic formula to factorise.

Using the quadratic formula we have

a= 1 ,b= 721 & c= -9972

n= -b ±√b²-4ac ÷ 2a

=>n= -721±√(721)²-4(1)(-9972)/2

=>n=-721±√519841-(-39888) / 2

=>n= -721±√519841+49888/2

=>n= -721±√ 559729 /2

Here,the discriminant b²-4ac is >0

So,there are two real roots

=>n= -721±√559729 /2

=>n= -721/2 ± 559729/2

simplifying the fraction terms

n= 13.5752

n= -734.575