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= 9 + 30x + 25x^2
= 4x^2 -20x - 25
= 25 - 30x + 9x^2
=4x²+12a+9
(3+5x)(3+5x)= 9+15x+15x+25x² = 9+30x+25x²
(2x-5)(2x-5)= 4x²-10x-10x+25= 4x²-20x+25
(5-3x)(5-3x)= 25-15x-15x+9X²=25-30x+9x²