Expanding a double bracket

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Messages: 1 - 4 of 4
• Message 1.

Posted by Livvy (U15617934) on Saturday, 16th February 2013

Hi im doing Standard Grade Maths (General/Credit) and i am i little puzzled at one of my homework questions.

4(x-2)+3(x-1)^2

(x-1) is squared

i was wondering if i times the brackets then all by 3???

Thanks for you help

Liv

• Message 2

, in reply to message 1.

Posted by Livvy (U15617934) on Saturday, 16th February 2013

there is also a question about surds

express with a rational denominator in its simplest form

21/square root of 7

how do i do this??

Thanks

• Message 3

, in reply to message 1.

Posted by Maths Teacher BBC (U15178780) on Sunday, 17th February 2013

4(x – 2) + 3(x – 1)2
= 4x – 8 + 3(x – 1)(x – 1)
= 4x – 8 + 3(x2 –x – x + 1)
= 4x – 8 + 3(x2 – 2x + 1)
= 4x – 8 + 3x2 -6x + 3
= 3x2 – 6x - 5

• Message 4

, in reply to message 2.

Posted by Maths Teacher BBC (U15178780) on Sunday, 17th February 2013

21 / √7
Multiply top and bottom by √7
= 21 x √7 / √7 x √7
= 21√7 / 7
= 3√7

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