Question

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

Answer 1

Answer: y=−2

Step-by-step explanation:

3y+10+5y=y−4

Combine 3y and 5y to get 8y.

8y+10=y−4

Subtract y from both sides.

8y+10−y=−4

Combine 8y and −y to get 7y.

7y+10=−4

Subtract 10 from both sides.

7y=−4−10

Subtract 10 from −4 to get −14.

7y=−14

Divide both sides by 7.

y= −14/7

​

Divide −14 by 7 to get −2.

y=−2

Answer 2

Answer:

20

Step-by-step explanation:

Substituting y = -2, we have

$7y(3y - 4) - 6y(y - 8)$

$= 7( - 2)((3 \times - 2) - 4) - 6( - 2)( - 2 - 8)$

$= - 14( - 6 - 4) + 12( - 10)$

$= - 14( - 10) + 12( - 10)$

$= ( - 10)( - 14 + 12)$

$= - 10 \times - 2$

$= 20$

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