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If 2a =  √64 and b/a = 3, Evalute a2 + b2 A. 25...
waec-2019 ssce-exam-2019 waec-mathematics-2019 math
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if 2a =  √64 and b/a = 3,

Evalute a2 + b2

A. 250

B.160

C. 90

D. 48

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peter
Asked by peterrep:1.8K
University of Lagos Nigeria
30 April 2020

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judziy, University of Benin
Answer C. 90
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judziy
Judziy answeredrep:2.0K
University of Benin Nigeria
13 May 2020
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2a√64

√64 = 641/2

Therefore,

2a = 641/2

From indices, 64 = 26

2a = 26(1/2)

2a = 26/2

2a = 23

a = 3

b/a = 3

b = 3a

b = 3(3)

b = 9

Therefore,

a2 + b2 = 32 + 92

= 9 + 81

= 90

Ans C

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