10 - x
5 x 10-10 = 0.0000000005
(-6) x (-3) = 18 (-10) x (-9) = 90 18 - 90 = -72
(6 x 10-2) / (1 x 10-12) = 6 x 10(-2+12) = 6 x 1010
6 - x + 7 - 3x - 5 = -2x - 10 ∴ x + 3x - 2x = 6 + 7 - 5 + 10 ∴ 2x = 18 ∴ x = 9
x2-2x-10-5 = 0 x2-2x-15 = 0 (x+3)(x-5) = 0 x = -3 or x = 5
x2-3x-10 = (x+2)(x-5) when factored
The expression is: 10-x
5 x 10-10 = 0.0000000005
(-6) x (-3) = 18 (-10) x (-9) = 90 18 - 90 = -72
(6 x 10-2) / (1 x 10-12) = 6 x 10(-2+12) = 6 x 1010
NO!!!! Here is a table for multiplication/division of 'double (+/-) signs.'. (+)(+) = (+) (+)(-) = (-) (-)(+) = (-) (-)(-) = (+) Sometimes in higher level maths, you can have triple signs. Here is the table. (+)(+)(+) = (+)(+) = (+) (+)(-)(-) = (-)(+) = (-) (-)(+)(+) = (-)(+) = (-) (-)(-)(-) = (+)(-) = (-) It is irrelevant on the position of the 'sign'. NB If no sign is given, then read it as positive (+).
(-11) x (-10) + (-20) 110 + (-20) 90
x=-16
6 - x + 7 - 3x - 5 = -2x - 10 ∴ x + 3x - 2x = 6 + 7 - 5 + 10 ∴ 2x = 18 ∴ x = 9
x2-2x-10-5 = 0 x2-2x-15 = 0 (x+3)(x-5) = 0 x = -3 or x = 5
4 x square root of 10 minus square root of 10 = 3 x square root of 10.
Answer : 130