Any product of any list of factors is zero, if one of the factors is zero.
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0.04c + 1.6 = 00.04c = -1.6c = -40
50 - 40 = 10 + 0
-4
If y2 + 13y = 40, then y ~ 15.55If y2 + 13y = 0, then y = -13Improved Answer:-y2+13y+40 = 0(y+5)(y+8) = 0Therefore: y = -5 and y = -8
x2+6x-40 = 0 (x+10)(x-4) = 0 x = 4 or x = -10