Answer:

(-5x^2 + 7x^2) + (12xy + xy) - 3y

(3^2)+(56)-4^3

And can you give samples so I can manage to understand this

NDEX LAWS Claws of exponent)

I. Multiplying two powers of the same. base, add the exponents.

II. In obtaining a power of a power.. multiply the exponents.

III. To obtain a power of a product, taise each factor of a product to the specified power & multiply

IV To obtain a power of a fraction raise the numerator & denominator to the specified power & divide.

V in dividing, one power, of a specified base by another power of. the base, subtract the exponents.