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2x^2+21x=-40

2x2+21x+40=0factors of 40=1&40, 2&20, 4&10, 5&85 & 8 are correct factors as 5 + 2*8 = 21(2x+5)(x+8)=0So, x = -8 & -2.5

Answered by Nirav M. • Maths tutor

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