Question

if 3a+4b=22,8a-5b=-4 then the value of ( a+b)^2​

Answer 1

I will give you an example but you have to this question yourself.

as everyone know that practise makes a man perfect

Starting with the second given equation;

3a + 5b + 7c = 30

(2a + 3b + 4c) + (a + 2b + 3c) = 30

35 + (a + 2b + 3c) = 30

a + 2b + 3c = -5______(1)

Now, using the first equation

2a + 3b + 4c = 35

( a + 2b + 3c) + (a + b + c)=35

-5 +(a + b + c)=35 [ using__(1)]

a + b +c=40

hope it will helpful........

Answer 2

Answer:

36

Explanation:

3a+4b=22----(i)

8a-5b=-4------(ii)

(i)×5+(ii)×4

15a+20b=110

32a-20b=-16

______________

47a=110-16

a=94÷47

a=2

then, b=(22-3×2)÷4

b=4

then, (a+b) ^2= 36