How To Expand Single Brackets - GCSE maths

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- work through the questions
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Here's the questions:

1. Multiply out the brackets and simplify where possible
0:00 Intro
0: 48 a. 4(x + y + z)
1:35 b. 5(x + y - z)
1:55 c. x(x + 6)
2:07 d. x(x - 9)
2:19 e. - 3(x + 2)
2:39 f. - 4( x - 5)
3:21 g. 7a(a + b + c)
3:40 h. 5b(a - b + c)
4:45 i. a - 4(a + b)
5:31 j. 4(x + 2 ) + 2(x + 1)
6:05 k. 7(x - 2) - 2(x - 1)
6:53 l. 4e(e + 2f) + 2f(e - f)

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[Boran]

for question I at the end, 2f multiplied by negative f is -2f^2.