Question

(-7) power x+2×(-7) power 5=(-D)power 10​

Answer 1

Step-by-step explanation:

(-7)^x+2×(-7)^5=(-D)^10

a^m×a^n=a^(m+n)

so (-7)^x+2+5=-D^10

(-7)^x+7=(-D)^10

By equating powers

×+7=10

×=3

so (-7)^10=(-D)^10

so D=7

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