Question

if a+b=7and ab=10; find a-b.

Answer 1

Answer:

3

Step-by-step explanation:

A=5 and B=2 because 5+2=7 and 5*2 =10

Answer 2

Answer:

3 , -3

Step-by-step explanation:

a + b = 7

Square on both sides

( a + b )^2 = (7)^2

a^2 + 2ab + b^2 = 49

a^2 + b^2 + 2(10) = 49

a^2 + b^2 = 49 - 20 = 29

( a - b )^2 = a^2 - 2ab + b^2 = a^2 + b^2 - 2ab = 29 - 2(10) = 9

( a - b )^2 = 9

a - b = √9 = +3 or -3

So a - b is 3 or -3

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