Question : If a + b = 17 and a – b = 9, the value of (4a2 + 4b2) is:
Option 1: 710
Option 2: 720
Option 3: 730
Option 4: 740
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Correct Answer: 740
Solution :
Given:
a + b = 17------------ (i)
a – b = 9------------ (ii)
Adding equation (i) and equation (ii), we get,
a + b + a – b = 17 + 9
⇒ 2a = 26
$\therefore$ a = 13
Replace a with 13 in equation (i) to get the value of b.
13 + b = 17
$\therefore$ b = 17 – 13 = 4
Replace a and b with their values in 4a
2
+ 4b
2
,
4(a
2
+ b
2
)
= 4(13
2
+ 4
2
)
= 4(169 + 16)
= 4 × 185
= 740
Hence, the correct answer is 740.
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