0
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
-----------
Still curious? Ask our experts.
Chat with our AI personalities
Blake
Rene
EzraAdd your answer:
Earn +20 pts
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 is the answer to 7x plus 13x plus 2x plus 8 equals?
Since 7x + 13x +2x + 8 is an expression (there is no equal sign), there is no answer as to what x equals. However, this expression can be simplified to 22x + 8.
If x2 - 13x plus 42 equals x plus Ax plus B then A plus B equals?
2x - 13x + 42 = x +ax + b a + b = 2(x - 6.5x + 21) = 34 = a + b
2x squared plus 13x-7?
2x2 + 13x - 7 = zero(2x - 1 )( x + 7 ) = zero2x - 1 = zerox = 1/2x + 7 = zerox = -7
X2 plus 13x plus 36 equals 0?
x2 + 13x + 36 = 0 so (x+4)(x+9) = 0 so that x = -4 or x = -9
