if A+b and A²+b²=16 find ab
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Answer:
68,
Step-by-step-explaination:
a + b = 10 ------------- ( 1 )
ab = 16 -----------------( 2 )
Square the equation ( 1 )
( a + b )^2 = ( 10 )^2
a^2 + b^2 + 2ab = 100
a^2 + b^2 + 2 x 16 = 100 [ form ( 2 ) ]
a^2 + b^2 + 32 = 100
a^2 + b^2 + 100 - 32
a^2 + b^2 = 68
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