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What non-zero integer must be placed in the square so that the simplified product of these two binomials is a binomial: \($(6x+4)(15x-\Box )$\)?

 Jul 22, 2019
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(6x+4)(15x-?)

90x^2 + 60x -? 6x  - ? 4

If ? = 10

this becomes

90x^2 -40

 Jul 22, 2019

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