Question

7y (3y – 4 ) – 6y ( y – 8 ) for y = – 2​

Answer 1

Answer:

$7y(3y - 4) - 6y(y - 8) \\ = (7. - 2 )[(3. - 2 )- 4] - (6. - 2) [ - 2 - 8] \\ = - 14( - 6 - 4) + 12 \times ( - 10) \\ = ( - 14) \times ( - 10) - 120 \\ 140 - 120 \\ = 20$

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