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Substituting x = – 3 in : x^2 – 5x + 4 g...

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

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

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

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

Substituting x =-3 in x^2+5x+4 gives, (-3)^2+5(-3)+4=9+2+4 = 15 Find and correct the error.

Substituting x =-3 in: x^2+5x gives: (-3)^2+5(-3)=-9-15=-24 . Find and correct the error

Subtract 5x^2 – 4y^2 + 6y – 3 from 7x^2 – 4xy + 8y^2 + 5x – 3y .

Find x , if (3x)/2 + (2x)/3 - (5x)/4 = 7

Find and correct the errors in the following mathematical statements. Substituting x =-2 in x^2+6x-9 gives (-2)^2+6(-2)-9=4+3-9=-2 .