Answer:
B. {-5, 12}
Step-by-step explanation:
the quadratic equation is given by the formula
x = -b± √b² - 4ac
2a
where a is the coefficient of x², b is the coefficient of x, and c is the constant
in the equation; x² - 7x -60 = 0
a = 1, b = -7, c = -60
x = -(-7)± √(-7)² - 4*1*-60 (negative sign multiplied by negative sign will
2*1 a positive sign)
x = 7 ± √49 + 240
2
x = 7 ± √289
2
x = 7 ± 17
2
x= 7 + 17 or 7 - 17
2 2
x = 24/2 or -10/2
x = 12 or -5
