Question

Aflati pe x stiind ca 3^7+3^8=3^7×x

Answer 1

$3^7+3^8=3^7*x \\\\ 3^7(1+3)=3^7*x \\\\ \not3^7*4=\not3^7*x \\\\ \boxed{x=4}$

Answer 2

3la7(1+3)=3la7xX
3la7x4=3la7xX   ÷3la7
 4=x
x=4