X=-0,8. (6x-1)^2-(10x+3)(10x-3)+(8x+1)^2

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First, let's substitute x = -0.8 into the given expression:

(6(-0.8) - 1)^2 - (10(-0.8) + 3)(10(-0.8) - 3) + (8(-0.8) + 1)^2
= (-4.8 - 1)^2 - (-8 + 3)(-8 - 3) + (-6.4 + 1)^2
= (-5.8)^2 - (-5)(-11) + (-5.4)^2
= 33.64 - (55) + 29.16
= 33.64 + 29.16 - 55
= 62.8 - 55
= 7.8

Therefore, when x = -0.8, the value of the expression (6x - 1)^2 - (10x + 3)(10x - 3) + (8x + 1)^2 is equal to 7.8.