# Maths Edexcel GCSEWatch

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#1
so my maths teacher gave me a booklet about expanding more than two brackets. I'm on the last question and it's really hard and I was wondering whether anyone has done this.

f(x)=3x3 - 2x2 + 4
Express f(x + 2) in the form ax3 + bx2 + cx + d

how am I meant to find f(x+2)???
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2 years ago
#2
(Original post by geeorgie)
so my maths teacher gave me a booklet about expanding more than two brackets. I'm on the last question and it's really hard and I was wondering whether anyone has done this.

f(x)=3x3 - 2x2 + 4
Express f(x + 2) in the form ax3 + bx2 + cx + d

how am I meant to find f(x+2)???
As f(x) = 3x ^ 3 - 2x^2 + 4,
f(x+2) = 3(x+2)^3 - 2(x+2)^2 + 4, basically substituting in (x+2), in the place of x.

I hope that makes it clearer
0
#3
(Original post by _gcx)
As f(x) = 3x ^ 3 - 2x^2 + 4,
f(x+2) = 3(x+2)^3 - 2(x+2)^2 + 4, basically substituting in (x+2), in the place of x.

I hope that makes it clearer
yes thank you, I solved it earlier!!
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