Question

$40 + 3x - x ^{2}$

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Answer 1

Answer:

x = 8     or     x = -5

Step-by-step explanation:

$-x^{2} +3x+40=0\\\\x^{2} -3x-40=0$

Using Factorization method,

$x^{2} -8x+5x-40=0\\\\x(x-8)+5(x-8)=0\\\\(x-8)(x+5)=0\\\\x-8=0\\ \\x=8$

$x+5=0\\\\x=-5$

Answer 2

this factorisation is solved by the method of splitting the middle term.