(x+4) (x-5) is a.x²+9x-20 b.x²-9x-20 c.x²+x-20 d.x²-x-20
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Step-by-step explanation:
( x + 4 ) ( x - 5 )
= x ( x - 5 ) + 4 ( x - 5 )
= x² - 5x + 4x - 20
= x² - x - 20
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