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Evaluate the expression (2x+4xy)(−y−8) when x=3 and y=6.

User Ashli
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Final answer:

When substituting x=3 and y=6 into the expression (2x+4xy)(-y-8), it simplifies to 78*(-14), which equals -1092.

Step-by-step explanation:

To evaluate the expression (2x+4xy)(-y-8) when x=3 and y=6, we first substitute the given values into the expression:

(2×3+4×3×6)(-6-8)

Now, we calculate the expression inside the parenthesis:

(6+4×18)(-14)

(6+72)(-14)

(78)(-14)

Next, we multiply the two numbers:

78×(-14) = -1092

Therefore, the value of the expression when x=3 and y=6 is -1092.

User Grigori Jlavyan
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