Question

40+3x-x^2
Spilt the middle term

Answer 1

hope it's helpful to you

Answer 2

Given

-x²+3x+40=0

now multiply by -1 on both sides

x²-3x-40=0

now split the middle term

-40= -8x5

so,

x²-8x+5x-40=0

x(x-8)+5(x-8)=0

(x+5) (x-8)=0

therefore

x=-5 and x=8

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