Respuesta :

Susuu
2x^2 + 12x = 66
2^2 = 4
4x + 12x = 66
16x = 66
x = 4.125
garydesir1

Subtract 66 from both sides

2x^2+12x -66 = 66-66

2x^2+12x-66= 0

Use quadratic formula with a=2, b=12 , c= -66

 x= −b±√b2−4ac2a

x=−(12)±√(12)2−4(2)(−66)2(2)x=−12±√6724x=−3+√42‌‌ or ‌‌x=−3−√42Answer:x=−3+√42‌‌ or ‌‌x=−3−√42
I hope that's help !