Science, asked by MiraculousBabe, 6 months ago

x²+mx-28=(x-7)(x+4)

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Answered by MrAttitude49

3

Answer:

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Answered by Mysteryboy01

2

$x²+mx-28=(x-7)(x+4) \\ \\ = (x-7)(x+4) \\ \\ = x(x + 4) - 7(x + 4) \\ \\ = {x}^{2} + 4x - 7x - 28 \\ \\ = {x}^{2} - 3x - 28 \\ \\ \\ x²+mx-28 = {x}^{2} - 3x - 28 \\ \\ {x}^{2} - {x}^{2} - 28 - 28 + mx = - 3x \\ \\ mx = - 3x \\ \\ m = - 3$

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