A=2x²-5²+3x²+2*3x*(-4)²
=4x²-25+9x²-24x
=4x²+9x²-24x-25
=11x²-24x-25
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Verified answer
Bonsoira = 4 x² + 10 x - 10 x - 25 + 9 x² - 24 x + 16
a = 13 x² - 24 x - 9
A=2x²-5²+3x²+2*3x*(-4)²
=4x²-25+9x²-24x
=4x²+9x²-24x-25
=11x²-24x-25