42 + x2 = 13x
∴ x2 - 13x + 42 = 0
∴ (x - 6)(x - 7) = 0
∴ x ∈ {6, 7}
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This is a quadratic equation question which will have two answers: 2x2+42 = x2+13x 2x2-x2-13x+42 = 0 x2-13x+42 = 0 Factorising the equation gives you: (x-6)(x-7) = 0 Therefore: x = 6 or x = 7
The expression cannot be factorised.
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3060.
They are equal. 7 squared is 7 x 7, which equals 49. 6 x 7 = 42, plus another 7 = 49.