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# Binomial Expansion 2 brackets. Watch

1. Heya, Its a simple query i have but could some please help me with this, (EDEXCEL C2)

[[[ The coefficent in the expansion of (2+x)(3-ax)^4 is 30 find the values of the constant a. ]]]

Thankyou
2. (Original post by StudentLucy)
Heya, Its a simple query i have but could some please help me with this, (EDEXCEL C2)

[[[ The coefficent in the expansion of (2+x)(3-ax)^4 is 30 find the values of the constant a. ]]]

Thankyou
Do the right side first so expand all of (3-ax)^4. Then multiply it by (2+x).
3. Yeah but, this is the question...

The coefficent of x^3 in the expansion of (2+x)(3-ax)^4 is 30. Find the values of the constant a.

Anyideas?

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