Subject
NSI নিয়োগ
Topic
জাতীয় নিরাপত্তা গোয়েন্দা সংস্থা (NSI) (সহকারী পরিচালক) - ০৮.১০.২০২১
x + y = 5, x + 4y = 4 what is the Value 4x2+ 20xy + 16y2?
x + y = 5, x + 4y = 4 what is the Value 4x2+ 20xy + 16y2?
ক)
60খ)
40গ)
20ঘ)
80Explanation
দেওয়া আছে, x + y = 5 x + 4y = 4 ∴ 4x 2 + 20xy + 16y 2 = 4x 2 + 4xy + 16xy + 16y 2 = 4x(x + y) + 16y(x + y) = (x + y)(4x + 16y) = 4(x + y)(x + 4y) = 4.5.4 = 80Related questions
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