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What is x squared plus 13x plus 12?
It's a quadratic expression: x²+13x+12 If, for example, x²+13x+12 = 0 then there are 2 roots, x=-1 and x=-12
What does 0 squared equal?
It equals 0. Zero times zero equals zero.
What is x squared plus 13x plus 36 equals 0 factor to?
Well, if that was a - 13X we could factor by inspection, but now the quadratic formula is needed. By inspection the discriminant yields two real roots. X^2 + 13X + 36 = 0 X = - b (+/-) sqrt(b^2-4ac)/2a a = 1 b = 13 c = 36 X = - 13 (+/-) sqrt[b^2 - 4(1)(36)]/2(1) X = - 13 (+/-) sqrt(169 - 144)/2 X = - 13 (+/-) sqrt(25)/2 X = [- 13 (+/-) 5]/2 X = - 4 ------------ X = - 9 -----------
X2 plus 13x plus 36 equals 0?
x2 + 13x + 36 = 0 so (x+4)(x+9) = 0 so that x = -4 or x = -9
Which equation has equal roots?
Lots, eg x2 - 2x + 1 = 0 which factorises as (x - 1)(x - 1) = 0
What is the roots of x squared - 13x equal 0 0?
x = zero and x = 13.
What is x squared plus 13x plus 12?
It's a quadratic expression: x²+13x+12 If, for example, x²+13x+12 = 0 then there are 2 roots, x=-1 and x=-12
42 plus X squared equals 13X?
42 + x2 = 13x ∴ x2 - 13x + 42 = 0 ∴ (x - 6)(x - 7) = 0 ∴ x ∈ {6, 7}
What is the answer for x squared plus 13x Plus 30?
x^2 + 13x + 30 = 0 x^2 + 10x + 3x + 30 = 0 x(x + 10) + 3(x + 10) = 0 (x + 3)(x + 10) = 0 x = -3 or x = -10
What is the sum of the roots of the equation 2x2-13x plus 17 equals 0?
6.50 to the nearest hundredth (4.685 & 1.815)
What is the value of k when the equation x squared plus 2kx plus 10x plus k squared plus 5 equals 0 has equal roots?
Using the discriminant of b^2 -4ac = 0 the value of k works out as -2
What is the value of k when the equation of 6x squared plus 2x plus k equals 0 has equal roots?
If: 6x^2 +2x +k = 0 has equal roots Then using the discriminant of b^2 -4ab=0: 4 -24k=0 => k=-4/-24 => k=1/6 Therefore the value of k = 1/6
How would you describe the roots when b2-4ac is 0?
The roots will be equal
Is a minus b squared the same as a squared minus b squared?
No, unless "a" happens to be equal to 0, or to 1.
Can you Solve x2 plus 13x equals -30?
x2 + 13x = -30 ∴ x2 + 13x + 30 = 0 ∴ (x + 3)(x + 10) = 0 ∴ x ∈ {-3, -10}
What is the interior angles of a stop sign?
3x squared - 12x - 24 = 0, and -b/a = sum of the roots, and c/a = product of the roots
What are the possible values of k when the equation x squared plus 2kx plus 81 equals 0 has equal roots?
Using the discriminant the possible values of k are -9 or 9
