Question

$10x ^{2} - 9x - 7$
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Answer 1

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10x²-9x-7=0

=>10x²-14x+5x-7=0

=>2x(5x-7)+1(5x-7)=0

=>(5x-7)(2x+1)=0

=>5x-7=0 or 2x+1=0

=>5x=7 or 2x= -1

=>x=7/5 or x= -1/2

hence, x=7/5 or -1/2

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Answer 2

Answer:

$= > 10 {x}^{2} - 9x - 7 \\ \\ = > 10 {x}^{2} - (14 - 5)x - 7 \\ \\ = > 10 {x}^{2} - 14x + 5x - 7 \\ \\ = > 2x(5x - 7) + 1(5x - 7) \\ \\ = > (5x - 7)(2x + 1)$