Question

(x – 5) (40 – x) is in standard form

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

$(x - 5)(40 -x) \\ x(40 - x) - 5(40 - x) \\ 40x - {x}^{2} - 200 + 5x \\ - {x}^{2} + 45x - 200 = 0 \\ - ( {x}^{2} - 45 x+ 200) = 0 \\ {x}^{2} - 45x + 200 = 0 \\ {x}^{2} - 40x - 5x + 200 = 0 \\ x(x - 40) - 5(x - 40) = 0 \\ (x - 40)(x - 5) \\ \\ x - 40 = 0 \\ x = 40 \\ \\ x - 5 = 0 \\ x = 5$

hope it's helpful......