Question

If a plus b is equal to 7 and ab is equal to 12 then the value of a2 minus ab plus b2 is

Answer 1

Answer:

13

Step-by-step explanation:

if ab = 12 then a and b shld factors of 12

a+b should be 7

so a and b can be 4 and 3 as 4+3=7 and 4*3 = 12

a²-ab+b² = 4²-12+3² = 16-12+9 = 4+9 =13

Answer 2

Answer:

13

Step-by-step explanation:

given

a + b = 7

ab = 12

find a^2 - ab + b^2

(a+b)^2= 7^2

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

a^2 + b^2 +2(12) = 49

a^2 + b^2 = 49 - 24

a^2 + b^2 = 25

a^2 - ab + b^2

= a^2 + b^2 - ab

= 25 - 12

= 13