Question

This is GCF so ..
-3x^4+12x^3-21x^2​

Answer 1

The greatest common factor in that expression is 3x², giving you the expression:

3x²(-x² + 4x -7)

Explanation:

All three terms are divisible by three:

3(-x⁴ + 4x³ - 7x²)

Each term is also divisible by x²:

3x²(-x² + 4x -7)

So the greatest common factor is 3x²