Question

If a + b = 3, a x a + b x b = 5 then ab is

Answer 1

Answer:

2

Step-by-step explanation:

1+2=3,1*1+2*2=5

therefore a*b=2

Answer 2

Step-by-step explanation:

a+b=3

a×a+b×b=5

a²+b²=5

(a+b)²=3²

a²+b²+2ab=9

substitute the value of a²+b²=5

5+2ab=9

2ab=9-5

2ab=4

ab=2

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