Explanation:
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4. (x+3) (x-5)
Multiply them.
Simplify them to get answer.
5. (2x-4) (3x-7).
Multiply them and simplify to get answer.
6. (3x^2 +2x +1) (x +3)
Multiply them and simplify them to get answer.
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Answer:
see below
4. ( x+3) ( x-5)
FOIL
x*x - 5x + 3x -15
Combine like terms
x^2 -2x-15
5. ( 2x-4) ( 3x-7)
2x*3x -7*2x -4*3x +28
6x^2 -14x -12x +28
6x^2 -26x +28
6. ( 3x^2 +2x+1) ( x+3)
Distribute
3x^2*x + 3x^2*3 + 2x*x + 2x*3 + x+3
3x^3 +9x^2 +2x^2 +6x+x+3
3x^3+11x^2+7x+3
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