x2-2x-10-5 = 0 x2-2x-15 = 0 (x+3)(x-5) = 0 x = -3 or x = 5
I think you've typed too many equalses, shouldn't there be a plus or a minus somewhere?
x = 15
2x2 + 2x - 8 = 2(x2 + x - 4). This can take any value greater than or equal to -8.5
2x to the fourth power minus 162 equals -146
X=7
If: 2x-3y = -15 and x = 4y Then: x = -12 and y = -3
x2-2x-10-5 = 0 x2-2x-15 = 0 (x+3)(x-5) = 0 x = -3 or x = 5
I think you've typed too many equalses, shouldn't there be a plus or a minus somewhere?
x = 15
2x2 + 2x - 8 = 2(x2 + x - 4). This can take any value greater than or equal to -8.5
2x to the fourth power minus 162 equals -146
The answer depends on the sign preceding the value 15 (which is not given in the question). If y = -2x+15 then (0,15) if y= -2x-15 then (0,-15)
3x=2x-12x=-12
This is a simultaneous equation question: x-2y = -4 2x-y = 1 Multiply all terms in the top equation by 2: 2x-4y = -8 2x-y = 1 Subtract the bottom equation from the top equation remembering that a minus minus equals a plus: -3y = -9 Divide both sides of the equation by -3 to find the value of y remembering that a minus divided by a minus equals a plus: y = 3 Substitute the value of y into the original equations to find the value of x: Solution: x = 2 and y = 3
x = 4 and y = 7
40