Question

If a + b = 5 and a-b = 4 then look at the values ​​of (a ^ 2 + b ^ 2) and ab.​

Answer 1

Answer:

a²+b²= 41/2 and ab = 9/4

Step-by-step explanation:

a-b=4 and a+b= 5

so

a+b+a-b= 5+4

2a= 9

a= 9/2

putting a = 9/2 in a+b= 5

9/2+b = 5

b = 5-9/2

= 1/2

a²+b² = (9/2)²+(1/2)²

= 81/4+1/4

= 82/4

= 41/2

ab = (9/2)(1/2)

= 9/4