1/9
4/12 - 2/9 = 3/9 - 2/9 = 1/9
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28
(3x - 4)(2x^2 + 6x + 5)
2(x + 2)(x - 2)(x2 + 2x + 4)(x2 - 2x + 4)
Using the distributive property of multiplication over addition, 2*[2 - 2] = 2*[2 + (-2)] = 2*2 + 2*(-2)LHS = 2*0 = 0RHS = 4 + 2*(-2)Therefore 2*(-2) = -4 and, by commutativity, -2*2 = -4Next-2*[2 - 2] = -2*[2 + (-2)] = -2*2 + -2*(-2)LHS = -2*0 = 0RHS = -4 + -2*(-2)Therefore -2 times -2 = +4
k = 7 x^4 - 5x^3 + 7x^2 + 3x - 10 = (x + 1)(x - 2)(x^2 - 4x + 5)