(21-3)times(7+4)
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If you mean: x^2+15-3x then its value is 19 when x equals 4
The value is 1 if (x, y) = (4, 3) and 0 otherwise.
If x stays the same the expression stays the same. Since the expression involves negative x, the value of the expression decreases as x increases.
5X - 2Y X = 9 Y = 4 5(9) - 2(4) 45 - 8 37 is the value
The vertex of this parabola is at -5 -2 When the x-value is -4 the y-value is 2. The coefficient of the squared expression in the parabola's equation is 4. y = a(x - h)2 + k; (h, k) = (-5, -2); (x, y) = (-4, 2) 2 = a[-4 -(-5)]2 - 2, add 2 to both sides 4 = a(-4 +5)2 4 = a(1)2 4 = a