Question

(7)^6 × (7)^4-y = 78

Please find the value of y...30 points for correct answer and nonsense would be deleted on the spot...

Please answer...Need it urgent

Answer 1

Step-by-step explanation:

(7)^6 × (7)^4 - y = 78

(7)^6+4 -y = 78

(7)^10 -y = 78

282,475,249 - y = 78

y = 282,475,249 - 78

Thus, y= 282,475,171

Answer 2

Answer:

$Value \:of \: y = 2$

Step-by-step explanation:

$Given, \:7^{6}\times 7^{4-y}=7^{8}$

$\implies 7^{6+4-y}=7^{8}$

$Since ,\boxed {a^{m}\times a^{n}=a^{m+n}}$

$\implies 6+4-y = 8$

$Since, \boxed { If \: a^{m}=a^{n} \:then \:m=n }$

$\implies 10-y = 8$

$\implies -y = 8 - 10$

$\implies -y = -2$

$\implies y = 2$

Therefore,

$Value \:of \: y = 2$

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