Explanation:
x^a × x^b = x^(a+b)
x^a / x^b = x^(a-b)
1.
(2x⁴)(-3x³) = 2×-3 × x⁴×x³ = -6x⁷
2.
a¹⁰×a⁴ = a¹⁴
3.
y¹⁰/y⁴ = y⁶
4.
(14 × x⁵y⁷)/(-2 × x²y⁴) = 14/-2 × x⁵/x² × y⁷/y⁵ =
= -7x³y²
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