Subtract:6x2 – 4xy + 5y2 from 8y2 + 6xy – 3x2

The subtraction is as follows:We can also write 8y2 + 6xy – 3x2 as -3x2 + 6xy + 8y2Therefore,The result is as follows: -9x2 + 10xy + 3y2

Q82 of 128 Page 224

Subtract:
6x² – 4xy + 5y² from 8y² + 6xy – 3x²

The subtraction is as follows:

We can also write 8y² + 6xy – 3x² as -3x² + 6xy + 8y²

Therefore,

The result is as follows: -9x² + 10xy + 3y²

Add:

3a (2b + 5c), 3c (2a + 2b)

Subtract:

5a²b²c² from -7a²b²c²

Subtract:

2a²b²c² + 4a²b²c - 5a²bc² from -10a²b²c + 4ab²c² + 2a²bc²

Subtract:

3t⁴–4t³ + 2t²–6t + 6 from -4t⁴ + 8t³-4t²-2t + 11