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4x*4x+9x+15=0
We add all the numbers together, and all the variables
9x+4x*4x+15=0
Wy multiply elements
16x^2+9x+15=0
a = 16; b = 9; c = +15;
Δ = b2-4ac
Δ = 92-4·16·15
Δ = -879
Delta is less than zero, so there is no solution for the equation
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