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Substituting x = – 3 in : x^2 + 5x gives...

Substituting x = – 3 in : `x^2 + 5x gives (– 3)^2 + 5 (–3) = – 9 – 15 = – 24`

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Substituting x = – 3 in : x^2 – 5x + 4 gives (– 3)^2 – 5 ( – 3) + 4 = 9 – 15 + 4 = – 2

Substituting x = – 3 in : x^2 + 5x + 4 gives (– 3)^2 + 5 (– 3) + 4 = 9 + 2 + 4 = 15

On substituting x= -2 in x^2+5x+4 we get :

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