0
X2 + X = 15
X2 + X - 15 = 0
Looks like a job for the quadratic formula. ( the discriminant says two real roots )
X = - b (+/-) sqrt(b2- 4ac)/2a
a = 1
b = 1
c = - 15
X = - 1 (+/-) sqrt[12 - 4(1)(- 15)]/2(1)
X = - 1 (+/-) sqrt(1 + 60)/2
X =[ - 1 (+/-) sqrt(61)]/2
---------------------------------exact answer
So, X = ~ 3.41
X = ~ - 4.41
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2
