Question

15.
Expand and simplify (x-4) (x + 7)
Answer
16

Answer 1

`{x}^(2) + 3x - 28`

Explanation:

F [First terms] - Multiply the first terms in each set of parentheses FARTHEST TO THE LEFT

O [Outside terms] - Multiply the first term in the first set of parentheses FARTHEST TO THE LEFT by the last term in the second set of parentheses FARTHEST TO THE RIGHT

I [Inside terms] - Multiply the last term in the first set of parentheses FARTHEST TO THE RIGHT by the first term in the second set of parentheses FARTHEST TO THE LEFT

L [Last terms] - Multiply the last terms in each set of parentheses FARTHEST TO THE RIGHT

`{x}^(2) + 3x - 28 = {x}^(2) + 7x - 4x - 28`

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