3x^2-8x+9-(4x^2-7x+16)-4(2x^2+9)
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3x^2-8x+9-(4x^2-7x+16)-4(2x^2+9)
3x^2-8x+9-(4x^2-7x+16)-4(2x^2+9)
3x^2-8x+9-(4x^2-7x+16)-4(2x^2+9)
3x^2-8x+9-(4x^2-7x+16)-4(2x^2+9)
=(3x^2-4x^2-8x^2)+(-8x+7x)+(9-16-36)
=-9x^2-x-43
3x^2-8x+9-(4x^2-7x+16)-4(2x^2+9)
=3x^2-8x+9-4x^2+7x-16-8x^2-36
=-9x^2-x-43
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