no 3x2=6 then 4x-15= -60 so 6 added with - 60 = -54
x2-5-4x2+3x = 0 -3x2+3x-5 = 0 or as 3x2-3x+5 = 0
2x^2 + 8x + 3 = 0
3x2 + 27x = 30 ∴ x2 + 9x - 10 = 0 ∴ (x + 10)(x - 1) = 0 ∴ x ∈ {-10, 1}
-3x2 + 22x = 0 You start by dividing both sides by x: ∴ -3x + 22 = 0 Then rearrange to solve for x: ∴3x = 22 ∴ x = 7 + 1/3
3x2 + 30x + 48 is a quadratic polynomial. If 3x2 + 30x + 48 = 0, then: 3(x + 2)(x + 8) = 0 ⇒ x + 2 = 0 → x = -2 or x + 8 = 0 → x = -8
3x2 + 17x + c = 0, rearranging gives c = -3x2 - 17x
x2-5-4x2+3x = 0 -3x2+3x-5 = 0 or as 3x2-3x+5 = 0
56
It is: 3x2+6x-11 = 0
(3x-4)(x+5)
2
3x2+14x+8 = 0 x = -2/3 or x = -4
2x^2 + 8x + 3 = 0
The discriminant is -32.
3x2 + 27x = 30 ∴ x2 + 9x - 10 = 0 ∴ (x + 10)(x - 1) = 0 ∴ x ∈ {-10, 1}
3
3x2 + 2x - 8 = 0 is a quadratic equation.