Question

29) If a+b=7 and ab=10, find the value of a2+b2.


hint that a=5
b=2

Answer 1

29....................
a2+b2=(5)²+(2)²= 29

Answer 2

Answer:

a+b = 7, ab=10

we can use the property

(a+b)2-(a-b)2= 4ab

So,

(7)2-(a-b)2=4*10

49-(a-b)2 =40

(a-b)2 =49-40

(a-b)2=9

(a-b)=√9

(a-b)=3

that's all

Step-by-step explanation: