Additional Mathematics
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'I I! I:, i I If b' < 4ac and a > 0, f(x) is always > 0. If b' < 4ac and a < 0, f(x) is always < 0. (a) D<O ...
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Example 1 Expand (a+ b)^8 • From the triangle the coefficients are I 8 28 56 70 56 28 8 I. Then (a+ b)'= !a^8 + 8a^1 b + 28a^6 b ...
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(b) (l - 2x)^3 (2 + x)^4 ; (l -6x + 12x^2 - Bx')(l6 + 32x + 24x^2 + Bx' + x') The first four terms will go up to the power of x' ...
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