Question

5 .If an integer is added to its square, the sum is 90. Find the integer with the help of
quadratic equation

​

Answer 1

Answer:

-10, 9

Hint :

We have, x+x

2

=90

⇒x

2

+x−90=0

⇒(x+10)(x−9)=0

Hope it helps you!

Answer 2

Let integer be x
A/Q
x^2 + x = 90
x^2 + x - 90 = 0
x^2 + 10x - 9x - 90 = 0
x(x + 10) -9(x + 10) = 0
(x + 10) (x - 9) = 0

x= -10 or
x= 9