Question

Q) If 64a²+36b2 = 400, ab = 4, then 8a + 6b is
1) 26
2) 28
3)22
4)24
REASONING TYPE:
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Answer 1

Answer:

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Step-by-step explanation:

64a2+36b2=400 -------->1

and ab=4 ------>2

Now, multiplying by 2 on both side in equation 2

Hence, 2ab=8 ---->3

Adding both equation 1 and 3,

64a2+36b2 + 2ab=400+8

(8a+6b)^2= 408

8a+6b=

$\sqrt{408}$

=20.199=20 (approx.)

HOPE IT HELPS YOU ☺️