Question

please give answer in maths​

Answer 1

Step-by-step explanation:

3¹³× 3^7 - 3^9×3³

= 3^(13+7) - 3^(9+3)

= 3^20 - 3^ 12

= 3^8

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Answer 2

Step-by-step explanation:

3¹³×3^7-3^9×3³

=(3¹³×3^7)-(3^9×3). [ a^m.aⁿ=a^m+n]

=(3^13+7)-(3^9+3)

=(3^20)-(3¹²)

=(3^10)²-(3^6)². [(a^m)ⁿ=a^mn]

=(3^10+3^6)(3^10-3^6)

(or)

(3^20)-(3¹²)

=(3¹²x 3^8)-(3¹²)

=3¹²(3^8-1)