Question

if a + b is equal to 10, ab is equal to 21 ,find the value of a a square + b square​

Answer 1

Answer:

100 is yor ans .

a+b =10

then,

by tacking sq. root on both side

i.e,

a^2 + b^2 = 10^2

a^2 + b^2 = 100

Answer 2

Step-by-step explanation:

given that

a + b = 10

ab = 21

then using formula :

( a + b ) ^2 - 2ab = a^2 + b^2

(10)^2 - 2× 21 = a^2 + b^2

100 - 42 = a^2 + b^2

58 = a^2 + b^2

58 is the value of a^2 + b^2.