3x−4y3x - 4y3x−4y3x+4y3x + 4y3x+4y + 4y+x4y + x4y+x4y−5x4y - 5x4y−5x
= 9x^2 - 16y^2 + 12xy + 12xy + 16y^2 - 20xy
= 9x^2 - 16y^2 + 24xy - 20xy
= 9x^2 + 4xy - 16y^2
-5−t/105 - t/105−t/10^2
= -25−5t/10+t2/10025 - 5t/10 + t^2/10025−5t/10+t2/100
= -25−t/2+t2/10025 - t/2 + t^2/10025−t/2+t2/100
= -25 + t/2 - t^2/100
a+b a+ba+b^2
= a^2 + 2ab + b^2
5a−b5a - b5a−bb−5ab - 5ab−5a
= 5a b - 25a^2 - b b + 5a * 5a
= 5ab - 25a^2 - b^2 + 25a^2
= -b^2 + 5ab - 25a^2
3x−4y3x - 4y3x−4y3x+4y3x + 4y3x+4y + 4y+x4y + x4y+x4y−5x4y - 5x4y−5x
= 9x^2 - 16y^2 + 12xy + 12xy + 16y^2 - 20xy
= 9x^2 - 16y^2 + 24xy - 20xy
= 9x^2 + 4xy - 16y^2
-5−t/105 - t/105−t/10^2
= -25−5t/10+t2/10025 - 5t/10 + t^2/10025−5t/10+t2/100
= -25−t/2+t2/10025 - t/2 + t^2/10025−t/2+t2/100
= -25 + t/2 - t^2/100
a+b a+ba+b^2
= a^2 + 2ab + b^2
5a−b5a - b5a−bb−5ab - 5ab−5a
= 5a b - 25a^2 - b b + 5a * 5a
= 5ab - 25a^2 - b^2 + 25a^2
= -b^2 + 5ab - 25a^2