Question

expand (3x+4y)²

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Answer 1

(a+b)^2

=a^2+b^2+2ab

9x^2+16y^2+24xy

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Answer 2

(3x+4y)²

( a+b) ² = a²+b²+2ab

== (3x)² + (4y) ² + 2×3x×4y

== 9x² + 16y² + 24xy