Question

If a+b=9,ab=4,find the value of a^2+b^2.​

Answer 1

Answer:

73

Step-by-step explanation:

a+b=9

ab=4

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

(9)^2=a^2+b^2+2(4)

81-8=a^2+b^2

a^2+b^2=73

Answer 2

Answer

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

=> 9^2 = a^2 + b^2 + 2(4)

=> 81 - 8 = a^2 + b^2

=> a^2 + b^2 = 73