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Verified answer
A) (3+5x)²@ (3+5b)(3+5b)
@ 9 + 15b + 15b + 25b²
@ 9 + 30b + 25b² atau 25b² + 30b + 9
b)(2x+ y)² + (x+2y+1)²
@((2x+y) (2x+y))+ ((x+2y+1)(x+2y+1))
@( 2x²+4xy+y²) + (x²+4xy+4y²+2x+4y+1)
@ 3x²+5y² + 8xy + 2x + 4y + 1
Semoga membantu... ^_^
=3 ^ + 5x^2
=9+25x