1) Simplifying this product, using the distributive property
(-3h -4)(4h-3)
-12h²+9h-16h+12
-12h²-7h +12
2) Inserting the table, or better making a similar one, multiplying the row by the column number:
_____|4h | -3 |
-3h | -12h² | 9h |
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-4 | -16h | 12
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-12h² +9h -16h +12
-12h² -7h +12
3) So the answer is -12h²-7h +12