Question

Please help asap!!!!!! (picture)

Answer 1

Answer:$6-\sqrt{21} , 6+\sqrt{21}$

Step-by-step explanation:

For $x^{2} =-12x+15$, so $x^{2} +12x-15=0$ We apply the quadratic equation formula:$(-b+-\sqrt{b^{2}-4*a*c })/2*a$, where $a=1, b=12 y c=-15$. so;

$(12+-\sqrt{12^{2} -4*1*(-15)} )/(2*1) = (12+-\sqrt{144-60})/2 = (12+-\sqrt{84})/2$, but $\sqrt{84} = 2\sqrt{21}$ We have that:

$Solution : (6-\sqrt{21} , 6+\sqrt{21} )$