Ms. Johnson asked her class to write an equivalent
1 answer:
<span>Ahmad wrote the correct expression. To prove that </span>7(2d + 3k - dk) - 7 is equal to 14d - 9 + 21k - 7dk + 2 Please check this solution: 7(2d + 3k - dk) - 7 = <span>14d - 9 + 21k - 7dk + 2 </span>7(2d + 3k - dk) - 7 = 14d + 21k - 7dk -9 + 2 7(2d + 3k - dk) - 7 = 14d + 21k - 7dk -7 Get the common variable which is 7. 7(2d + 3k - dk) - 7 = 7(2d + 3k - dk) - 7 For checking, we can simplify the equation... from 7(2d + 3k - dk) - 7 = 14d - 9 + 21k - 7dk + 2 We simplify it to: 7(2d + 3k - dk) - 7 = 14d + 21k - 7dk -7 7 * 2d = 14d 7 * 3k = 21k 7 * - dk = -dk Therefore, 7(2d + 3k - dk) - 7 is equal to 14d + 21k - 7dk -7
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